Question

A toroid of n turns, mean radius R and cross-sectional radius
a carries current I. It is placed on a horizontal table taken as
xy-plane. Its magnetic moment m
(a) is non-zero and points in the z-direction by symmetry
(b) points along the axis of the toroid (m = mΦ)
(c) is zero, otherwise there would be a field falling as 1/r³ at
large distances outside the toroid
(d) is pointing radially outwards

Answer 1

Answer:

don't know it my dear Friend

Answer 2

Answer:

c option is correct

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