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

• A. Remain unaffected
• B. Start moving in a circular path Y-Z plane
• C. Retard along X-axis
• D. Move along a helical path around X-axis

Answer 1

Answer: (A)

Remain unaffected

Answer 2

$\overrightarrow { F _ { m } } = q ( \vec { v } \times \vec { B } )$

When the angle between $\vec { v }$ and $\vec { B }$ is 180^o, F_m = 0