Question

The magnetic field due to current carrying circular loop of radius 3 cm at a point on the axis at a distance of 4 cm from the centre is 54uT. Its value at the centre of loop is nearly

Answer 1

magnetic field at axis = u0i 16/ 2 ( 25)^3/2
= uoi 8/125= 54
I= 54×125/8uo

magnetic field at center = uoi/ 2r
= 54×125/48