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A 250-turns recantagular coil of length...

A 250-turns recantagular coil of length 2.1 cm and width 1.25 cm carries a current of `85 muA` and subjected to magnetic field of strength `0.85 T`. Work done for rotating the coil by `180^(@)` against the torque is

A

`4.55 muJ`

B

`2.3 muJ`

C

`1.15 muJ`

D

`9.1 muJ`

Text Solution

Verified by Experts

The correct Answer is:
D
`W=MB(cos theta_(1)-cos theta_(2))`
`=MB(cos0-cos180^(@))=2MB`
`=2NIAB`
`=2xx250xx85xx10^(-6)xx2.1xx1.25xx10^(-4)xx0.85`
`=9.1xx10^(-6)J= 9.1 muJ`
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