Question

Two concentric circular coils A and B have radii 25 cm and 15 cm and carry currents 10A and 15A respectively. A has 24 turns, and B has 18 turns. The direction of currents are in opposite order. The magnetic induction at the common centre of the codlis

• A. $120{\mu }_{0}T$
• B. $480{\mu }_{0}T$
• C. $420{\mu }_{0}T$
• D. ${\mu }_0$

Answer 1

Answer: (C)

$B=B_1-B_2$