☰
✕

Moving Charges And Magnetism
Question
Wired Faculty App

A proton moving vertically downward enters a magnetic field pointing towards north. In which direction proton will deflect?

  • East

  • West

  • North

  • South

Answer

A.

East

Proton will represent the direction of current. So, the direction of current is vertically downward.

According to Fleming's left hand rule, if middle finger represents the direction of current and fore-finger represents the direction of magnetic field then thumb will represent the direction of Lorentz force acting on the proton which deflects the proton in east direction.

Sponsor Area

Some More Questions From Moving Charges And Magnetism Chapter

Two moving coil meters, M1 and M2 have the following particulars:
R1 = 10 Ω   N1 = 30,
A1 = 3.6 x 10–3 m2,  B1 = 0.25 T
R2 = 14 Ω;  N2 = 42,
A2 = 1.8 x 10–3 m2, B2 = 0.50 T
(The spring constants k are identical for the two meters).
Determine the ratio of (a) current sensitivity and (b) voltage sensitivity of M2 and M1.