Questions
If the radius of a circular coil is doubled and the current flowing in it is halved then the new magnetic moment will be ……units. Its initial magnetic moment is 4 units .
a
8
b
4
c
2
d
zero
detailed solution
Correct option is A
M=πR2Ni ⇒M∝R2i∵m=NiA ⇒M1M2=R1R22i1i2 ⇒M1M2=14×2 ⇒4M2=12 ⇒M2=8Talk to our academic expert!
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