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A toroid of n turns, mean radius R and c...

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 x-y plane. Its magnetic moment `vecm`.

A

(a) is non zero and points in the z-direction by symmetry.

B

(b) point along the axis of the toroid `(vecm=m hatphi)`

C

(c) is zero, otherwise there would be a field falling as `1/r^3` at large distance outside the toroid.

D

(d) is pointing radially outwards.

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