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Questions  

In a gravity free space a charged particle is projected. If the kinetic energy of the particle charges but it suffers no deviation, then in that region of space

a
E and B both must be zero
b
‘E’ must be zero but ‘B’ may not be zero
c
‘B’ and ‘E’ both may not be zero and B→ and E→ must be patallel.
d
‘B’ must be zero but ‘E’ may not be zero.

detailed solution

Correct option is C

If B→ and E→ are parallel and the particle is projected or anti parallel to the field then magnetic force acting on the particle is zero. So the particle does not suffer any deviation. But due to the action of electric field, the particle accelerates and its kinetic energy changes.

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