a charged particle moves in a gravity-free space without change in velocity.which of the following is/are possible?

(A)E=0,B=0 (B)E=0,Bnot=O (C)Enot=0,B=0 (D)Enot=0,Bnot=0

Freind :)

Answer must be A.

Explaination:

 As its moving with constant velocity it must not be experiencing any force as accelaration is =0. Therefore no Electric force hence no electric field is present there, also there is no magnetic field as a charge moves in circular path which is also a type of acceleration and causes change in velocity vector, 
therefore E=0 and also B=0. :)
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