Question

This question relates to particles placed in the electric field shown below.
A particle is placed into the electric field (E),which has a magnetic field superimposed on it as shown. Where in the electric field will the three particles named below be located after a short period of time if they start at Point E?
The particle is a proton

• A. A
• B. B
• C. C
• D. D
• E. E

Answer 1

Answer: (C)

C

Proton is a positively charged particle , so it will be repelled by positive plate and be attracted by negative plate , so it goes towards plate $B$. Now being a charged moving (due to electric field) particle proton experiences a force by magnetic field , the direction of this force will be given by Fleming's left hand rule or right hand screw rule , applying any one of these rule we find that force on proton is towards $C$.