Question

Two long, straight, parallel wires separated by a distance d carry currents in opposite directions as shown in the figure. The bottom wire carries a current of 6.0 A. Point C is at the midpoint between the wires and point O is a distance 0.50d below the 6-A wire as suggested in the figure. The total magnetic field at point O is zero tesla. a. Determine the value of the current, I, in the top wire. Determine the magnitude of the magnetic field at point C if d = 0.10 m

Answer 1

a)

field at point O is zero

B = 0

uI/2pix1.5d - u6/2pix0.5d = 0

I = 6x3

I = 18 A

at point C

Bc = u/2pix0.5d ( 18-6)

Bc = 0.000048 T