Question
Question: A particle of charge Q and of negligible initial speed is accelerated through a potential difference...
A particle of charge Q and of negligible initial speed is accelerated through a potential difference of U. The particle reaches a region of uniform magnetic field of induction B, where it undergoes circular motion . If potential difference is doubled and B is also doubled then magnetic moment of the circular current due to circular motion of charge Q will become.
A
Double
B
Half
C
Four times
D
Remain same
Answer
Double
Explanation
Solution
K.E = QU magnetic moment = i × Area = 
× pR2
\ T = 
R = 
= 
Magnetic moment = 
× 
Magnetic moment = QU