Question

A particle of charge q and mass m moves in a circular orbit of radius r with angular speed w. The ratio of the magnitude of its magnetic moment to that of its angular momentum depends on –
(a) ω and q
(b) ω, q and m
(c) q and m
(d) ω and m

Answer 1

As we learnt in 
Magnetic moment (M) -
M=NiA
- wherein
N-number of turns in the coil 
i-current throughout the coil 
A-area of the coil 
 
Magnetic moment 
 
angular momentum 


Option 1)
ω and q
 
incorrect
Option 2)
ω, q and m
 
incorrect
Option 2)
ω, q and m
 
incorrect
Option 3)
q and m
 
correct
Option 4)
ω and m
 
incorrect