Question

1
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
y plane. Its magnetic moment m
in the direction by symmetry​

Answer 1

Explanation:

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

points along the axis of the toroid

is zero, otherwise there would be a field falling as

at large distance outside the toroid

is pointing radially outwards.

Answer :

C

Solution :

In case of a toroid, the magnetic field is only confined inside the body of toroid in the form of concentric magnetic lines of force and there is no magnetic field outside the body of toroid. Thus the magnetic moment of toroid is zero. Hence, option (c) is correct.