question

(a) derive the expression for the magnetic energy stored in an inductor when a current i develops in it. hence, obtain the expression for the magnetic energy density.

(b) a square loop of sides 5 cm. carrying a current of 0.2a. in the clockwise direction is placed at a distance of 10 cm from an infinitly long wire carrying current of 1a as shown. calculate (i) the resultant magnetic force, and (ii) the torque, if any, acting on the loop.

 

 

 

 

 

 

 

1531