A positive point charge moves with velocity perpendicular to a uniform magnetic field

PHYSICS · Single correct · CBSE · Physics · Moving Charges and Magnetism · Moving Charges and Magnetism

Problem

A positive point charge moves with velocity

\mathbf v

perpendicular to a uniform magnetic field

\mathbf B

. Which of the following best describes the direction of the magnetic force acting on the charge at that instant? (a) Along

\mathbf B

(b) Zero, because only an electric field exerts force (c) Perpendicular to both

\mathbf v

and

\mathbf B

(d) Perpendicular to both

\mathbf v

and

\mathbf B

, but opposite to

\mathbf v\times \mathbf B