Question

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Answer 1

Answer:

Option(D) - Zero

Explanation:

The work done to rotate the loop in magnetic field :

$W = MB(cos \theta_{1} - cos \theta_{2})$

When current carrying coil is rotated then there will be no change in angle between magnetic moment and magnetic field.

Here,

$\theta_{1} - \theta_{2} = \alpha$

⇒ W = MB(cosα - cosα)

⇒ W = 0

Hope it helps!