A collimated beam of charged and uncharged particles is directed towards a hole marked P on a screen as shown below. If the electric and magnetic fields as indicated below are turned on.

Options

A. only particles with speed E/B will go through the hole P
B. only charged particles with speed E/B and neutral particles will go through P
C. only neutral particles will go through P.
D. only positively charged particles with speed E/B and neutral particles will go through P

Answer

C

Explanation

For charged particles

net force is in downward direction, so they won’t be able to go through the hole P. And uncharged particle don’t deviate so they will be able to go through hole P