The overhead cable for a street trolley is strung horizontally 5 m above the ground.A long straight section of it carries a 100 A current due west.What is the magnetic field due to the current in the cable at street level directly under the cable?

Question

Quizplus · Accepted Answer

The magnetic field due to a current-carrying conductor can be calculated using the right-hand rule and the formula B = μ₀I/(2πr), where μ₀ = 4π x 10^-7 Tm/A, I = 100 A, and r = 5 m. The direction is perpendicular to the plane formed by the current direction and the line from the point to the wire, which means it points south in this case.

The Overhead Cable for a Street Trolley Is Strung Horizontally