(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 0.2 A in the clockwise direction is placed at a distance of 10 cm from an infinitely long wire carrying a current of 1 A as shown in Fig. 6.66. Calculate (i) the resultant magnetic force, and (ii) the torque, if any, acting on the loop.

(a) Derive the expression for the magnetic energy stored in an inducto

1.	(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 0.2 A in the clockwise direction is placed at a distance of 10 cm from an infinitely long wire carrying a current of 1 A as shown in Fig. 6.66. Calculate (i) the resultant magnetic force, and (ii) the torque, if any, acting on the loop.
Answer» Answer :(b) (i) `1.33 xx 10^(-8) N, attractive (ii) zero

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