Question

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

• 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 1

Answer: (C)

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 $P$.