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When a current carrying coil is placed i...

When a current carrying coil is placed in a uniform magnetic field of induction `B`, then a torque `tau` acts on it. If `I` is the current, `n` is the number of turns and `A` is the face area of the coil and the normal to the coil makes an angle `theta` with `B`, Then

A

`tau=BInA`

B

`tau = B I nA sin theta`

C

`tau=B InA cos theta`

D

`tau=B I n A tan theta`

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