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 unaffected
start moving in a circular path in Y−Z plane
retard along X−axis
move along a helical path around X− axis
A
start moving in a circular path in Y−Z plane
B
retard along X−axis
C
move along a helical path around X− axis
D
remain unaffected
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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=0
Hence charge remains unaffected.
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