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A circular loop and a square loop are fo...

A circular loop and a square loop are formed from two wires of same length and cross section. Same current is passed through them. Then the ratio of their dipole moments is

A

4

B

`2/pi`

C

2

D

`4/pi`

Text Solution

Verified by Experts

The correct Answer is:
D
The ratio of dipole moments,
`(M_(1))/(M_(2))=(ipir^(2))/(ia^(2))=(pi(l/2pi)^(2))/((l/4)^(2))=pi(16)/(4pi^(2))=(4)/(pi)`
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