Question
12 A circular coil of 20 turns and 10 cm radius is placed
in a uniform magnetic field of 0.10 T normal to the
plane of the coil. If the current in the coil is 5 A,
cross-sectional area is 10-5 m2 and coil is made up
of copper wire having free electron density about
1029 m3, then the average force on each electron in
the coil due to magnetic field is
(a) 2.5 x 10-25 N
(c) 4 x 10-25 N
(b) 5 x 10-25 N
(d) 3 x 10-25 N