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Two coils of radii r and 2r: condition for equal magnetic moments

The same question, asked 2 times: 4 May 2023 S1, 13 Apr 2026 S2. Every wording below, oldest first.

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  1. Question 1

    4 May 2023 S1

    29
    The magnetic moments associated with two closely wound circular coils A and B of radius rA=10r_A = 10 cm and rB=20r_B = 20 cm respectively are equal if (NA,IAN_A, I_A and NB,IBN_B, I_B are number of turns and current of A and B respectively)

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  2. Question 2

    13 Apr 2026 S2

    135
    The magnetic moments associated with two closely wound circular coils a and b of radius rr and 2r2r respectively are equal if (where NaN_a, IaI_a and NbN_b, IbI_b are number of turns and current in A and B respectively)

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