The wire in the figure below carries a current of 14 A. Suppose that a second lo

Question

The wire in the figure below carries a current of 14 A. Suppose that a second long, straight wire is placed right next to this wire. The current in the second wire is 34 A. Use Amp?re's law to find the magnitude of the magnetic field at a distance of r = 0.72 m from the wires when the currents are in the same direction and in opposite directions.

The wire in the figure below carries a current of 14 A. Suppose that a second long, straight wire is placed right next to this wire. The current in the second wire is 34 A. Use Amp½re's law to find the magnitude of the magnetic field at a distance of r = 0.72 m from the wires when the currents are in the same direction and in opposite directions.

Explanation / Answer

B= k l/r

k=2x10^-7

case a:

I=14+34=48A

B=1.33x10^{-5} T

case b:

I=14-34=-20A

B=-5.56x10^{-6} T

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