Each of the lettered points at the corners of the cube as shown in Fig. 1.60 represents a positive charge q moving with a velocity of magnitude v in the direction indicated. The region in the figure is in a uniform magnetic field `vec B`, parallel to the x-axis and directed toward right. Copy the figure, find the magnitude and direction of the force on each charge and show the force in your diagram.

Answer

A

Explanation

Apply `F=q(vxxB)`
for example let us apply for charged particle at e.
`F_e=q[(v/sqrt2hatj-v/sqrt2hatk)xx(Bhati)]`
`=(qvB)/sqrt2(-hatj-hatk)`