Questions
A wire of length I metre carrying a current i ampere is bent in the form of a circle. The magnitude of magnetic moment is
a
iL2/4π
b
iL2/2π
c
iL/4π
d
πiL2
detailed solution
Correct option is A
The magnetic moment is given bypm=iA=iπr2Given that 2πr=L or r=(L/2π)∴ pm=iπ(L/2π)2=iL2/4πTalk to our academic expert!
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A circular loop has a radius of 5 cm and it is carrying a current of 0.1 A. Its magnetic moment is
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