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Byju's Answer
Standard XII
Physics
Current Loop Is a Magnet?
A wire of len...
Question
A wire of length L metre carrying a current of I ampere is bent in the form of a circle. Its magnitude of magnetic moment will be equal to?
A
I
L
4
π
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B
I
L
2
4
π
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C
I
2
L
2
4
π
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D
I
2
L
4
π
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Solution
The correct option is
B
I
L
2
4
π
If the radius of circle is r, then
2
π
r
=
L
⇒
r
=
L
2
π
Area
=
π
r
2
=
π
L
2
4
π
2
=
L
2
4
π
Magnetic moment
=
I
A
=
I
L
2
4
π
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