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A charge moving with velocity v in X-direction is subjected to a field of magnetic induction in negative X-direction. As a result, the charge will
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- remain unaffected
- start moving in a circular path Y–Z plane
- retard along X-axis
- move along a helical path around X-axis
Correct Option: A
The force acting on a charged particle in magnetic field is given by
→F = q (→v × →B) or F = qvB sin θ,
When angle between v and B is 180°, F = 0
