Question

A circular coil of wire consisting of 100 turns, each of radius `8*0cm` carries a current of `0*40A`.
What is the magnetude of the magnetic field `vecB` at the centre of the coil?

Answer 1

Here, `n=100`, `r=8*0xx10^-2m`, `I=0*40A`, `B=?`
`B=(mu_0)/(4pi)(2pinI)/(r)=10^-7xx2xx(22)/(7)xx(100xx0*4)/(8xx10^-2)=3*1xx10^-4T`