Question

Two concentric rings are kept in the same plane. Number of turns in both the rings is 20. Their radii are 40 cm and 80 cm and they carry electric currents of 0.4 A and 0.6 A respectively, in mutually opposite directions. The magnitude of the magnetic field produced at their centre is _____ T.
(A) 4 μ₀
(B) 2 μ₀
(C) 10/4 μ₀
(D) 5/4 μ₀

Answer 1

The rings are placed in circular coils and thus magnetic field reaches at a point 20cm and turns each other at a same plane.

It is located with the magnitude of the field and thus circulates at a point 20cm from wire is 3.5x10-5 T.

There are five layers of windings of 400 turns each other on the Solenoid.

Answer 2

Holla ^_^

☸ Required Answer is ⬇ ⬇⬇ ⬇

☯ (A) 4 μ₀


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