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# A charge moving with velocity v in X− direction is subjected to a field of magnetic induction in the negative X direction. As a result the charge will :remain unaffectedstart moving in a circular path in Y−Z planeretard along X−axismove along a helical path around X− axis

A
move along a helical path around X axis
B
remain unaffected
C
retard along Xaxis
D
start moving in a circular path in YZ plane
Solution
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#### velocity V is in X direction and magnetic field B is in negative X direction hence angle between the velocity and magnetic field is 180o.In given case force on moving charge due to magnetic field is given by,F=qVBsin180o=0Hence charge remains unaffected.

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