Question

please answer this question​

Answer 1

Answer:

answer is 2M/Pi

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Answer 2

Answer:

2 M / Pi = 2M / π

Explanation:

We know, magnetic moment = M= m × ℓ ....(eq.1) , when wire is bent, the pole strength remains same & when it is in the form of semicircular arc, the separation between poles in 2r. (r is radius of semicircle).

∴ πr = ℓ

∴ r = (ℓ/π)

∴ New magnetic moment = M' = m × 2r = m × (2ℓ/r) = (2M/π) from (1)

Hence, the required answer = 2M / π