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)

$420\,\mu_0\,T$

Answer 2

$B=B_1-B_2$