THIS  WARRANT  HAS NOT BEEN  REGISTERED  UNDER THE  SECURITIES  ACT OF 1933,  AS
AMENDED (THE "SECURITIES ACT") OR ANY OTHER APPLICABLE STATE SECURITIES LAWS AND
HAS BEEN ISSUED IN RELIANCE UPON  REGULATION D PROMULGATED  UNDER THE SECURITIES
ACT. THIS WARRANT SHALL NOT CONSTITUTE AN OFFER TO SELL NOR A SOLICITATION OF AN
OFFER TO BUY THE WARRANT IN ANY JURISDICTION IN WHICH SUCH OFFER OR SOLICITATION
WOULD BE UNLAWFUL.

THIS WARRANT MAY NOT BE SOLD,  PLEDGED,  TRANSFERRED OR ASSIGNED EXCEPT PURSUANT
TO AN  EFFECTIVE  REGISTRATION  STATEMENT  UNDER  THE  SECURITIES  ACT AND UNDER
APPLICABLE  STATE  SECURITIES  LAWS,  OR IN A  TRANSACTION  WHICH IS EXEMPT FROM
REGISTRATION  UNDER THE PROVISIONS OF THE SECURITIES ACT AND UNDER PROVISIONS OF
APPLICABLE STATE  SECURITIES LAWS; AND IN THE CASE OF AN EXEMPTION,  ONLY IF THE
COMPANY  HAS  RECEIVED  AN  OPINION OF COUNSEL  THAT SUCH  TRANSACTION  DOES NOT
REQUIRE  REGISTRATION  OF THE WARRANT,  WHICH OPINION AND WHICH COUNSEL SHALL BE
SATISFACTORY TO THE COMPANY IN ITS SOLE DISCRETION.

No. __

                                    WARRANT B

                  To Purchase ______ Shares of Common Stock of

                              XYBERNAUT CORPORATION


            THIS CERTIFIES that, for value received, ___________________________
(the  "Investor"),  is  entitled,  upon the terms and subject to the  conditions
hereinafter  set forth, at any time on or after October 15, 1998 and on or prior
to October 15, 2003 (the  "Termination  Date") but not thereafter,  to subscribe
for and purchase from XYBERNAUT CORPORATION,  a corporation  incorporated in the
State of Delaware (the  "Company"),  _________  _______________  (______) shares
(the  "Warrant  Shares")  of Common  Stock,  par value US $0.01 per share of the
Company (the "Common  Stock").  The purchase  price of one share of Common Stock
(the  "Exercise  Price") under this Warrant shall be equal to $2.81 The Exercise
Price and the number of shares for which the  Warrant  is  exercisable  shall be
subject to  adjustment  as  provided  herein.  This  Warrant is being  issued in
connection  with the Private Equity Line Of Credit  Agreement  dated on or about
April 13, 1998 (the "Agreement"), and is subject to its terms and conditions. In
the event of any conflict  between the terms of this Warrant and the  Agreement,
the Agreement shall control.









            1.    Title of Warrant.  Prior to the expiration  hereof and subject
to compliance  with applicable  laws, this Warrant and all rights  hereunder are
transferable, in whole or in part, at the office or agency of the Company by the
holder hereof in person or by duly authorized  attorney,  upon surrender of this
Warrant together with the Assignment Form annexed hereto properly endorsed.

            2.    Authorization of Shares. The Company covenants that all shares
of Common Stock which may be issued upon the exercise of rights  represented  by
this Warrant will, upon exercise of the rights  represented by this Warrant,  be
duly authorized,  validly issued, fully paid and nonassessable and free from all
taxes,  liens and charges in respect of the issue  thereof  (other than taxes in
respect of any transfer occurring contemporaneously with such issue).

            Exercise of Warrant. Except as provided in Section 4 below, exercise
of the purchase  rights  represented  by this Warrant may be made at any time or
times,  before the close of business on the  Termination  Date,  or such earlier
date on which this  Warrant may  terminate as provided in this  Warrant,  by the
surrender  of this Warrant and the Notice of Exercise  Form annexed  hereto duly
executed,  at the office of the Company  (or such other  office or agency of the
Company as it may designate by notice in writing to the registered holder hereof
at the address of such holder  appearing  on the books of the  Company) and upon
payment of the Exercise  Price of the shares  thereby  purchased;  whereupon the
holder of this Warrant shall be entitled to receive a certificate for the number
of  shares of Common  Stock so  purchased.  Certificates  for  shares  purchased
hereunder shall be delivered to the holder hereof within three (3) business days
after the date on which this Warrant  shall have been  exercised  as  aforesaid.
Payment  of the  Exercise  Price  of the  shares  may be by  certified  check or
cashier's  check or by wire transfer to an account  designated by the Company in
an amount  equal to the  Exercise  Price  multiplied  by the  number of  Warrant
Shares.

            4.    No Fractional  Shares or Scrip. No fractional  shares or scrip
representing  fractional  shares  shall  be  issued  upon the  exercise  of this
Warrant.

            5.    Charges,  Taxes and  Expenses.  Issuance of  certificates  for
shares of Common Stock upon the  exercise of this Warrant  shall be made without
charge to the holder  hereof for any issue or transfer  tax or other  incidental
expense in respect of the issuance of such  certificate,  all of which taxes and
expenses shall be paid by the Company,  and such certificates shall be issued in
the  name of the  holder  of this  Warrant  or in such  name or  names as may be
directed by the holder of this  Warrant;  provided,  however,  that in the event
certificates  for  shares of Common  Stock are to be issued in a name other than
the name of the  holder of this  Warrant,  this  Warrant  when  surrendered  for
exercise  shall be  accompanied  by the  Assignment  Form  attached  hereto duly
executed by the holder  hereof;  and  provided  further,  that upon any transfer
involved in the  issuance or delivery of any  certificates  for shares of Common
Stock,  the Company may require,  as a condition  thereto,  the payment of a sum
sufficient to reimburse it for any transfer tax incidental thereto.





                                       2




            6.    Closing of Books.  The Company will not close its  shareholder
books or records in any  manner  which  prevents  the  timely  exercise  of this
Warrant for a period of time in excess of five (5) trading days per year.

            7.    No Rights as Shareholder until Exercise. This Warrant does not
entitle the holder  hereof to any voting rights or other rights as a shareholder
of the Company prior to the exercise thereof. Upon the surrender of this Warrant
and the payment of the aggregate Exercise Price, the Warrant Shares so purchased
shall be and be deemed to be issued to such  holder as the record  owner of such
shares as of the close of business on the later of the date of such surrender or
payment.

            8.    Assignment  and  Transfer  of  Warrant.  This  Warrant  may be
assigned by the surrender of this Warrant and the Assignment Form annexed hereto
duly  executed at the office of the  Company (or such other  office or agency of
the Company as it may  designate by notice in writing to the  registered  holder
hereof at the address of such holder appearing on the books of the Company).

            9.    Loss, Theft, Destruction or Mutilation of Warrant. The Company
represents and warrants that upon receipt by the Company of evidence  reasonably
satisfactory to it of the loss, theft, destruction or mutilation of this Warrant
certificate or any stock certificate relating to the Warrant Shares, and in case
of loss, theft or destruction,  of indemnity or security reasonably satisfactory
to it, and upon surrender and cancellation of such Warrant or stock certificate,
if  mutilated,  the  Company  will  make  and  deliver  a new  Warrant  or stock
certificate  of like  tenor and dated as of such  cancellation,  in lieu of such
Warrant or stock certificate.

            10.   Saturdays,  Sundays,  Holidays,  etc. If the last or appointed
day for the  taking of any action or the  expiration  of any right  required  or
granted herein shall be a Saturday,  Sunday or a legal holiday, then such action
may be taken or such right may be  exercised  on the next  succeeding  day not a
legal holiday.

            11.   Effect of Certain Events.

            (a)   If at any time the Company  proposes  (i) to sell or otherwise
convey all or  substantially  all of its assets or (ii) to effect a  transaction
(by  merger or  otherwise)  in which  more than 50% of the  voting  power of the
Company is disposed of (collectively, a "Sale or Merger Transaction"),  in which
the  consideration  to be received by the Company or its  shareholders  consists
solely of cash,  then the Warrant  shall  terminate  if the Warrant has not been
exercised by the effective date of such transaction,  the Company shall give the
holder of this Warrant thirty (30) days' notice of such  termination  and of the
proposed effective date of the transaction.

            (b)   In case the Company  shall at any time effect a sale or merger
transaction  in which the  consideration  to be  received  by the Company or its
shareholders  consists in part of  consideration  other than cash, the holder of
this Warrant shall have the right  thereafter  to purchase,  by exercise of this
Warrant and payment of the aggregate  Exercise Price in effect immediately prior
to such action,  the kind and amount of shares and other securities and property
which it would have owned or have been  entitled to receive  after the happening
of such transaction had this Warrant been exercised immediately prior thereto.

                  The Company  agrees that the Warrant  Shares shall be included
in the Registration Statement to be filed by the Company pursuant to the Private
Equity Line Of Credit Agreement dated on or about April 13, 1998.





                                       3




            12.   Adjustments  of Exercise  Price and Number of Warrant  Shares.
The number and kind of securities  purchasable upon the exercise of this Warrant
and the Exercise Price shall be subject to adjustment from time to time upon the
happening of any of the following.

            In case the Company shall (i) declare or pay a dividend in shares of
Common Stock or make a distribution  in shares of Common Stock to holders of its
outstanding Common Stock, (ii) subdivide its outstanding shares of Common Stock,
(iii) combine its  outstanding  shares of Common Stock into a smaller  number of
shares  of Common  Stock or (iv)  issue any  shares  of its  capital  stock in a
reclassification  of the  Common  Stock,  then  the  number  of  Warrant  Shares
purchasable  upon  exercise of this Warrant  immediately  prior thereto shall be
adjusted  so that the holder of this  Warrant  shall be  entitled to receive the
kind and number of Warrant  Shares or other  securities  of the Company which he
would  have  owned or have  been  entitled  to  receive  had such  Warrant  been
exercised in advance  thereof.  Upon each such adjustment of the kind and number
of Warrant  Shares or other  securities  of the  Company  which are  purchasable
hereunder,  the holder of this Warrant shall  thereafter be entitled to purchase
the number of Warrant Shares or other securities  resulting from such adjustment
at an  Exercise  Price per such  Warrant  Share or other  security  obtained  by
multiplying the Exercise Price in effect immediately prior to such adjustment by
the number of Warrant Shares  purchasable  pursuant hereto  immediately prior to
such adjustment and dividing by the number of Warrant Shares or other securities
of the Company  resulting from such  adjustment.  An adjustment made pursuant to
this paragraph shall become  effective  immediately  after the effective date of
such event retroactive to the record date, if any, for such event.


            13.   Voluntary  Adjustment  by the Company.  The Company may at any
time during the term of this Warrant,  reduce the then current Exercise Price to
any  amount  and for any  period  of time  deemed  appropriate  by the  Board of
Directors of the Company.

            14.   Notice of Adjustment. Whenever the number of Warrant Shares or
number or kind of securities or other property  purchasable upon the exercise of
this Warrant or the Exercise Price is adjusted, as herein provided,  the Company
shall promptly mail by registered or certified mail,  return receipt  requested,
to the holder of this Warrant notice of such  adjustment or adjustments  setting
forth  the  number  of  Warrant  Shares  (and  other   securities  or  property)
purchasable  upon the exercise of this  Warrant and the  Exercise  Price of such
Warrant Shares (and other securities or property) after such adjustment, setting
forth a brief statement of the facts requiring such adjustment and setting forth
the computation by which such  adjustment was made.  Such notice,  in absence of
manifest  error,  shall  be  conclusive  evidence  of the  correctness  of  such
adjustment.

            15.   Authorized  Shares.  The  Company  covenants  that  during the
period the Warrant is  outstanding,  it will  reserve  from its  authorized  and
unissued Common Stock a sufficient  number of shares to provide for the issuance
of the  Warrant  Shares  upon the  exercise of any  purchase  rights  under this
Warrant.  The Company further  covenants that its issuance of this Warrant shall
constitute  full  authority  to its  officers  who are charged  with the duty of
executing stock certificates to execute and issue the necessary certificates for
the Warrant Shares upon the exercise of the purchase  rights under this Warrant.
The Company will take all such  reasonable  action as may be necessary to assure
that such Warrant Shares may be issued as provided  herein without  violation of
any applicable law or regulation, or of any requirements of the NASDAQ Small Cap
Stock Market or any domestic securities exchange upon which the Common Stock may
be listed.




                                       4




            16.   Call/Forced  Exercise.  The Company, at its option, may redeem
this  Warrant for $0.01 per Warrant  Share by giving the Holder  written  notice
(the "Call  Notice") at any time after the  Registration  Statement  is declared
effective,  and the  closing  bid price of the  Common  Stock of the  Company is
greater than one hundred fifty (150%)  percent of the Exercise  Price for twenty
(20)  consecutive  Trading Days. To be effective,  the Call Notice must be given
within three (3) days after the aforementioned twenty day period. The rights and
privileges  granted  pursuant to this Warrant shall  terminate  thirty (30) days
after the Call  Notice is sent to the  Holder if the  warrant  is not  exercised
during that  period.  In the event the Warrants  are not  exercised  during this
period the Company  will remit to the Holder  $0.01 per  Warrant  Share upon the
Holder tendering to the Company the expired Warrant certificate.

            17.   Miscellaneous.

            (a)   Issue Date; Jurisdiction. The provisions of this Warrant shall
be construed  and shall be given effect in all respects as if it had been issued
and  delivered by the Company on the date hereof.  This Warrant shall be binding
upon any successors or assigns of the Company.  This Warrant shall  constitute a
contract  under  the laws of New York  without  regard to its  conflict  of law,
principles  or rules,  and be subject to  arbitration  pursuant to the terms set
forth in the Agreement.

            (b)   Restrictions.  The holder hereof acknowledges that the Warrant
Shares acquired upon the exercise of this Warrant, if not registered,  will have
restrictions  upon resale  imposed by state and federal  securities  laws.  Each
certificate  representing  the Warrant Shares issued to the Holder upon exercise
will bear the following legend:

            "THE  SECURITIES   EVIDENCED  BY  THIS  CERTIFICATE  HAVE  NOT  BEEN
      REGISTERED  UNDER  THE  U.S.  SECURITIES  ACT OF  1933,  AS  AMENDED  (THE
      "SECURITIES  ACT"), OR ANY OTHER APPLICABLE  SECURITIES LAWS AND HAVE BEEN
      ISSUED IN RELIANCE UPON AN EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF
      THE SECURITIES ACT AND SUCH OTHER SECURITIES  LAWS.  NEITHER THIS SECURITY
      NOR ANY INTEREST OR PARTICIPATION HEREIN MAY BE REOFFERED, SOLD, ASSIGNED,
      TRANSFERRED,  PLEDGED, ENCUMBERED,  HYPOTHECATED OR OTHERWISE DISPOSED OF,
      EXCEPT  PURSUANT  TO  AN  EFFECTIVE   REGISTRATION   STATEMENT  UNDER  THE
      SECURITIES  ACT OR PURSUANT TO A  TRANSACTION  THAT IS EXEMPT FROM, OR NOT
      SUBJECT TO, SUCH REGISTRATION".

            (c)   Modification  and  Waiver.  This  Warrant  and any  provisions
hereof may be changed, waived, discharged or terminated only by an instrument in
writing signed by the party against which enforcement of the same is sought.

            (d)   Notices.  Any notice,  request or other  document  required or
permitted to be given or delivered to the holders hereof by the Company shall be
delivered or shall be sent by certified or registered mail, postage prepaid,  to
each such  holder at its  address as shown on the books of the Company or to the
Company at the address set forth in the Agreement.

            IN  WITNESS  WHEREOF,  the  Company  has caused  this  Warrant to be
executed by its officer thereunto duly authorized.






                                       5




Dated:  April __, 1998

                                                   XYBERNAUT CORPORATION


                                                   By__________________________




                               NOTICE OF EXERCISE



To:        XYBERNAUT CORPORATION



            (1)   The undersigned  hereby elects to purchase  ________ shares of
Common  Stock,  par  value  $  per  share  (the  "Common  Stock")  of  XYBERNAUT
CORPORATION  pursuant to the terms of the attached Warrant, and tenders herewith
payment of the exercise  price in full,  together with all  applicable  transfer
taxes, if any.

            (2)   Please issue a certificate or certificates  representing  said
shares of Common Stock in the name of the  undersigned  or in such other name as
is specified below:

                               _______________________________
                               (Name)

                               _______________________________
                               (Address)
                               _______________________________

            (3)   The shares of Common Stock being issued in connection with the
exercise of the attached  Warrant are [not] being issued in connection  with the
sale of the Common Stock.


Dated:


                                                 _______________________________
                                                 Signature





                                        1








                                 ASSIGNMENT FORM

                    (To assign the foregoing warrant, execute
                   this form and supply required information.
                 Do not use this form to exercise the warrant.)



            FOR VALUE RECEIVED,  the foregoing  Warrant and all rights evidenced
thereby are hereby assigned to

_______________________________________________ whose address is

___________________________________________________________________.



___________________________________________________________________

                                                    Dated:  ______________, 1998


                          Holder's Signature:    _____________________________

                          Holder's Address:      _____________________________

                                                 _____________________________



Signature Guaranteed:  ___________________________________________




NOTE: The signature to this  Assignment Form must correspond with the name as it
appears on the face of the Warrant,  without  alteration or  enlargement  or any
change whatsoever,  and must be guaranteed by a bank or trust company.  Officers
of  corporations  and  those  acting  in an  fiduciary  or other  representative
capacity  should  file  proper  evidence of  authority  to assign the  foregoing
Warrant.




                                       2