railway RRB Technician Grade 1 Mock Test 2024 Physics Moving Charges and Magnetism The Magnetic Dipole Moment
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
1
is non-zero and points in the z-direction by symmetry.
2
points along the axis of the tortoid \(\rm (m = m\widehat \phi ).\)
3
is zero, otherwise there would be a field falling as \(\frac{1}{r^3}\) at large distances outside the toroid.
4
is pointing radially outwards.