Q. 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 in $Y$-$Z$ plane
C) Retard along $X$-axis
D) Move along a helical path around $X$-axis
Explanation
(a) $\overrightarrow{F_{m}} = q(\overrightarrow{v} \times \overrightarrow{B})$
When the angle between $\overrightarrow{v}$ and $\overrightarrow{B}$ is $180{^\circ},\ F_{m} = 0$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.