A 250-turn rectangular coil of length 2....

A 250-turn rectangular coil of length 2.1 cm and width 1.25 cm carries a current of 85`muA` and subjected to a magnetic field of strength 0.85 T.Work done for ratatiing the coil by `180^(@)` against the troque fis

`1.15muJ`

`9.1muJ`

`4.55muJ`

`2.3muJ`

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