# Electromagnetics - Two long wires carry equal, but opposite currents

Another Electromagnetics question....

Two long wires carry equal, but oppositely directed, 25 A currents. What is the magnitude of magnetic field due to these currents at point P? The wires are 0.1 m apart and point P is 0.05m in between the wires.

Would the following be the correct way to solve it?

B = (4pi * 10^-7)(25) / (2)(pi)(0.05)

(Phys. 12)

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Drevin said:
Another Electromagnetics question....

Two long wires carry equal, but oppositely directed, 25 A currents. What is the magnitude of magnetic field due to these currents at point P? The wires are 0.1 m apart and point P is 0.05m in between the wires.

Would the following be the correct way to solve it?

B = (4pi * 10^-7)(25) / (2)(pi)(0.05)

(Phys. 12)
1. Do you know the expression for magnetic field set up by a long straight wire (of course you do).

2. At point P can you determine the directions of the two fields (due to the two wires)?

3. Determine the fields and add them vectorially

Hootenanny
Staff Emeritus