Question

What should be the amount oi current passing through the ring of radius 5 cm, so that magnetic field at its centre is 7 x 10^-5 Wb/m²?

(a) 0.5 A

(b) 0.28 A 

(c) 2.8 A

(d) 5.6 A

Answer 1

Correct option (d) 5.6 A

Explanation:

Given that the field at the centre of the ring B = 7 x 10^-5 Wb/m²

We know that B = μ₀I/2r