Question

A circular coil has $200$ turns of radius $5$ cm each and carries a current of $5$ A. Then find $T$?

Answer 1

the number of coils n is 200

r is 5cm r 0.005m

current i is 2.5 A

magnetic field B 0.25T

$\theta ={90}^0-{60}^0={30}^0$

$T=BInsin\theta$

$T=200\times 2.5\times 0.25\times 3.14\times .05\times .05\times sin{30}^0$

$T=0.49Nm$