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Standard XII
Physics
Question

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
  1. move along a helical path around X axis
  2. remain unaffected
  3. starts moving in a circular path
  4. retard 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
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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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