Each of two long straight parallel wires 15 cm apart carries a current of 150 A

Question

Each of two long straight parallel wires 15 cm apart carries a current of 150 A. The figure shows a cross section, with the wires running perpendicular to the page and point P lying on the perpendicular bisector of the line between the wires. Find the magnitude and direction of the magnetic field at P when the current in the left-hand wire is out of the page and the current in the right-hand wire is also out of the page.

a. What is the magnitude of B?

b. Find the magnitude and direction of the magnetic field at P when the current in the left-hand wire is out of the page and the current in the right-hand wire is into the page. What is the magnitude of B?

Explanation / Answer

B= mue0 *i/2*phi*r

    B=(2*10^-7)*150/0.015=0.02 T

b) zero

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