Question

A wire of length l is bent round in the form of a coil having n turns of same radius. if a steady current i flows through it in a clockwise direction, find the magnitude and direction of the magnetic field produced at its centre

Answer 1

magnitudes is 5 magnectic clock wish direction

Answer 2

Mm= I x A

Here, we can write , 2πr= L

Or. r= L/2π.

Area of circle formed= π r²= π (L/2π)²

Or A= L/ 4π

Hence , Mm= I x A = I x L/4π