A conductor consists of a circular loop of radius `R =10 cm` and two straight, long sections as shown in figure. The wire lies in the plane of the paper and carries a current of `i = 7.00 A` Determine the magnitude and direction of the magnetic field at the centre of the loop.

Explanation

Both straight and circular wire wire produce magnetic fields inwards.
`:. B=mu_0/(2pi)i/R+(mu_0i)/(2R)`
`=((2xx1^-7)(7))/0.1 +((4pixx10^-7)(7))/(2xx0.1)`
`=5.8xx10^-5T`