Question

When a charged particle moving with velocity $\overset{ \rightarrow }{v}$ is subjected to a magnetic field of induction $\overset{ \rightarrow }{B}$ , the force on it is non-zero. This implies that

• A. angle between $\overset{ \rightarrow }{v}$ and $\overset{ \rightarrow }{B}$ is either zero or $180^{o}$
• B. angle between $\overset{ \rightarrow }{v}$ and $\overset{ \rightarrow }{B}$ is necessarily $90^{o}$
• C. angle between $\overset{ \rightarrow }{v}$ and $\overset{ \rightarrow }{B}$ can have any value other than $90^{o}$
• D. angle between $\overset{ \rightarrow }{v}$ and $\overset{ \rightarrow }{B}$ can have any value other than zero and $180^{o}$

Answer 1

Answer: (D)

$\because $ $F=qvBsin \theta $
$F=0$ , if $\theta =0^{o}$ or $180^{o}$