The average radius of a toroid made on a ring of non-magnetic material is 0.1 m and it has 500 turns. If it carries 0.5 ampere current, then the magnetic field produced along its circular axis inside the toroid will be
(a) 25 x 10-2 Tesla
(b) 5 x 10-2Tesla
(c) 25 x 10-4 Tesla
(d) 5 x 10-1 Tesla
