Question

When a current in a circular loop is equivalently replaced by a magnetic dipole

• A. the pole strength m of each pole is fixed
• B. the distance d between the poles is fixed
• C. the product md is fixed
• D. none of the above

Answer 1

Answer: (C)

Magnetic moment is the product of pole strength and the distance between the poles.
If the loop is replaced by an equivalent magnetic dipole, the product md is fixed.