Doubt in Magentics

Question 7
Upload written solution. MuLTI Correct.
Answer is AD

This is apllicable only when r1<<<r2.IMG-20191113-WA0002


But in the question it is not mentioned that r1<<<<<r2

They should have mentioned that cause that's the only way this can be solved. Otherwise, magnetic field will be variable everywhere on the ring and we can't solve that.

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Yes that was the problem I faced. Thanks for clearing out.

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