A circular loop of wire having a radius of `8.0 cm` carries a current of `0.20 A`. A vector of unit length and parallel to the dipole moment W of the loop is given by `0.60 hati-0.80 hatj` . if the loop located in uniform magnetic field given by `B= (0.25 T)hati+ (0.30 T)hatk` find,
(a) the torque on the loop and
(b) the magnetic potential energy of the loop.

Explanation

(a) `(-6.4 xx 10^(-4) hat(i) - 4.8 xx 10^(-4) hat(j) + 1.6 xx 10^(-3) hat(k)) N.m`, (b) `-0.30 mu = -1.2 xx 10^(-3) J`