Question

A uniform conducting wire of length 10a and resistance R is wound up into four turn as a current carrying coil in the shape of equilateral triangle of side a. If current I is flowing through the coil then the magnetic moment of the coil is

• A. $\frac { \sqrt { 3 } } { 2 } a ^ { 2 } I$
• B.
• C. $\sqrt { 3 } a ^ { 2 } I$
• D.

Answer 1

Answer: (C)

$\sqrt { 3 } a ^ { 2 } I$

Answer 2

Magnetic moment M =NIA,