A magnetic wire of dipole moment 4 π A m 2 is bent in the form of semicircle. The new magnetic moment is

Question

A magnetic wire of dipole moment 4 π A m 2 is bent in the form of semicircle. The new magnetic moment is, 4 π A m 2, 8 π A m 2, 4 A m 2, None of these

MARKS App · Accepted Answer

Here, M i = 4 π m L = 4 π m = 4 π L The new distance between poles is L 1 = 2 r = 2 L 2 π = L π ∴ M f = m L 1 = m L π = 4 π π = 4 A m 2

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