Q.

In a gravity free region of space a charged particle is projected. If the path followed by the particle is a circle, then

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a

E= and B=0

b

E≠0 and B≠0

c

E=0, B≠0 and uniform

d

E=0 and B≠0 and B→ is non-uniform

answer is C.

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Detailed Solution

If E = 0 and B ≠ 0 and uniform, then perpendicular to B→, then magnetic force QV→×B→ acting on the particle is always perpendicular to the direction of motion and the trajectory of the particle is a circle.
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