Question

Part A

As shown in the figure, two long straight wires are separated by a distance of d = 0.4 m. The currents are I 1= 3.0 A to the right in the upper wire and I 2 = 7.0 A to the left in the lower wire. What are the magnitude of the magnetic field at point P, which is a distance d/2 = 0.20 m below the lower wire? (?0 = 4?

Answer 1

Here ,

magnetic field due to wire is given as

B = u0*I/(2*pi*d)

Now , at point P

Bp = B1 - B2

Bp = u0*(3/(0.4 + 0.2) - 7/(.2))/2*pi

Bp = -6 .00 *10^-6 T

the magnitude of magnetic field is 6 .00 *10^-6 T