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

Options

A. remain unaffected
B. start moving in a circular path Y-Z plane
C. retard along X-axis
D. moving along a helical path around X-axis

Answer

A

Explanation

The force acting on a charged particle in magnetic field is given by
`vec(F) = q(vec(v) xx vec(B)) or F=qvB sin theta" " :.` Force, F= 0
When angle between v and B is `180^(@)`