Figure shows a cross-section of a long ribbon of width `omega` that is carrying a uniformly distributed total current i into the page. Calculate the magnitude and direction of the magnetic field `B` at a point `P` in the plane of the ribbon at a distance d from its edge. `

Answer

A, D

Explanation

`dB=mu_0/(2pi)((i/omega).dx)/x`
`:. B=(mu_0i)/(2piomega) int_d^(d+omega) (dx)/x`
`B=(mu_0)/(2piomega) 1n ((d+omega)/(d) (upwards)