   Chapter 19, Problem 54P

Chapter
Section
Textbook Problem

Two long, parallel wires separated by a distance 2d carry equal currents in the same direction. An end view of the two wires is shown in Figure P19.54, where the currents are out of the page. (a) What is the direction of the magnetic field at P on the x-axis set up by the two wires? (b) Find an expression for the magnitude of the field at P. (c) From your result to part (b), determine the field at a point midway between the two wires. Does your result meet with your expectation? Explain. Figure P19.54

(a)

To determine
The direction of the magnetic field at point P on the x-axis set up by the two wires.

Explanation

Given Info: The distance between the two wires is 2d . The wires carry current in the same directions. The current in the wires are out of the page. Point P is in x-axis and point P is in the y-axis.

Explanation:

The point P is in the same distance from the

(b)

To determine
An expression for the magnetic field at point P .

(c)

To determine
The magnetic field at a point mid way between the two wires.

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