A circular coil of 20 turns and radius 10 cm is placed in an uniform magnetic field of 0.1 T normal to the plane of the coil. The coil carries a current of 5 A. The coil is made up of copper wire of cross-sectional area 10- 5 m2 and the number of free electrons per unit volume of copper is 1029. The average force experienced by an electron in the coil due to magnetic field is
(a) 5 × 10-25N
(b) zero
(c) 8× 10-24
(d) none of these
