An iron bar of length L has magnetic moment M. It is bent at its midpoint such that its two halves make an angle of 60° with each other. The magnetic moment of the new magnet is:
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An iron bar of length L has magnetic moment M. It is bent at its midpoint such that its two halves make an angle of 60° with each other. The magnetic moment of the new magnet is:

G1 Physics · Accepted Answer

Step 1: The original pole separation is L, and M = mL. Step 2: After bending, two halves each have length L/2 and included angle 60°. Their free-end separation is 2(L/2)sin30° = L/2. Step 3: New moment M′ = m(L/2) = M/2. Correct A. Final answer: (A) M/2.