Q5.1Multiple choice
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 m
- (a)is non-zero and points in the z-direction by symmetry.
- (b)points along the axis of the tortoid ( m = m φˆ ).
- (c)is zero, otherwise there would be a field falling as at large r3 distances outside the toroid.
- (d)is pointing radially outwards.