Magnetic Field Produced by Straight Currents Video Lessons

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Problem: Two long wires are parallel and carry current in opposite directions. The currents are 8.0 and 12 A and the wires are separated by 0.40 cm. The magnetic field in tesla at a point midway between the wires is:A. 0B. 4.0 × 10–4C. 8.0 × 10–4D. 12 × 10–4E. 20 × 10–4

FREE Expert Solution

Magnetic field around a wire carrying current:

B=μ0i2πr

Right-hand rule: Thumb points in the direction of current, fingers curl in the direction of the current.

Applying the right-hand rule to wires carrying current in opposite directions, the magnetic field between them is directed in the same direction. 

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Problem Details

Two long wires are parallel and carry current in opposite directions. The currents are 8.0 and 12 A and the wires are separated by 0.40 cm. The magnetic field in tesla at a point midway between the wires is:

A. 0

B. 4.0 × 10–4

C. 8.0 × 10–4

D. 12 × 10–4

E. 20 × 10–4

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