Two flat circular coils have a common center, but their planes are at right angles to each other.The inner coil has 150 turns and radius of π cm.The outer coil has 400 turns and a radius of 2π cm. The magnitude of the resultant magnetic induction at the common centers of the coils when a current of 200 mA is sent through each of them is
(a) 10–3 Wb/m2
(b) 2 × 10–3 Wb/m2
(c) 5 × 10–3 Wb/m2
(d) 7 × 10–3 Wb/m2
