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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 willmove along a helical path around X axisremain unaffectedstarts moving in a circular pathretard along X-axis

A
move along a helical path around X axis
B
remain unaffected
C
retard along X-axis
D
starts moving in a circular path
Solution
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#### F=q(→V×→B)=qVBsin0=qVBsin(1800)(∵ velocity is in X-direction and B is in -X-direction)=0(∵sin1800=0)So, charge will be more unaffected.

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