11.4 Magnetic Force on a Current-Carrying Conductor

Force on a wire as current times length times field, its direction from the right-hand rule, and the sine dependence on the angle between them.

University Physics Volume 2, 11.4 Magnetic Force on a Current-Carrying Conductor

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4 exercises

11.4 Exercise 1

A straight, flexible length of copper wire is immersed in a magnetic field that is directed into the page. (a) If the wire’s current runs in the +x-direction, which way will the wire bend? (b) Which way will the wire bend if the current runs in the –x-direction?

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11.4 Exercise 3

Considering the magnetic force law, are the velocity and magnetic field always perpendicular? Are the force and velocity always perpendicular? What about the force and magnetic field?

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11.4 Exercise 5

A magnetic field exerts a force on the moving electrons in a current carrying wire. What exerts the force on a wire?

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11.4 Exercise 11

(a) A dc power line for a light-rail system carries 1000 A at an angle of 30.0º to Earth’s $5.0 \times 10^{−5} \text{T}$ field. What is the force on a 100-m section of this line? (b) Discuss practical concerns this presents, if any.

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