Question

Magnetic field at the centre of a circular loop of area A is B. The magnetic moment of the loop is

• A.
• B. $\frac { \mathrm { BA } \sqrt { \mathrm { T } } } { \mu _ { 0 } }$
• C. $\frac { \mathrm { BA } \sqrt { \mathrm { A } } } { \mu _ { 0 } \pi }$
• D.

Answer 1

Answer: (D)

Answer 2

Let r be the radius of the circular loop

$\therefore \mathrm { A } = \pi \mathrm { r } ^ { 2 }$

Or $\mathrm { r } = \sqrt { \frac { \mathrm { A } } { \pi } }$

Magnetic field at the centre of the loop is

The magnetic moment of the loop is