v34

A

`(4m)/pi`

B

`m/pi`

C

`(2m)/pi`

D

`(3m)/pi`

Text Solution

Verified by Experts

The correct Answer is:
A


Let current be I and side of square is a
`m=Ixxa^2`
`4a=2piR`
`m = Ixx` Area `=I xx piR^2`
`implies I xxpixx(4a^2)/pi^2=Ia^2xx4/piimpliesm.=(4m)/pi`
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