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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 `vec M`

A

is non-zero and points in the z-direction by symmetry

B

points along the axis of the toroid `(vec M = M hat phi)`

C

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

D

is pointing radially outwards

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