Q. The magnetic force acting on a charge particle of charge $- 2\mu c$ in a magnetic field of $2T$ actin in $y$ direction, when the particle velocity is $(2i + 3j) \times 10^{6}ms^{- 1}$ is
A) $8\ N$ in $- z$ direction
B) $8\ N$ in $z$ direction
C) $8\ N$ in $y$ direction
D) $8\ N$ in $z$ direction
Explanation
(a) $\overrightarrow{F} = q\left( \overrightarrow{v} \times \overrightarrow{B} \right) = - 2 \times 10^{- 6}\left\lbrack \left\{ \left( 2\widehat{i} + 3\widehat{j} \right) \times 10^{6} \right\} \times 2\widehat{j} \right\rbrack$
$\overrightarrow{F} = - 8\widehat{k}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.