Question

A uniform conducting wire of length 12a and resistance ‘R’ is wound up as a current carrying coil in the shape of,

1. an equilateral triangle of side ‘a’.
2. a square of side ‘a’.

The magnetic dipole moments of the coil in each case respectively are :

Options

• 3 Ia² and 4 Ia² 

• 4 Ia² and 3 Ia² 

• ${\displaystyle \sqrt{3}}$ Ia² and 3 Ia² 

• 3 Ia² and Ia² 

Answer 1

${\displaystyle \sqrt{3}}$ Ia² and 3 Ia²