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A simple motor is made in a school labor...

A simple motor is made in a school laboratory. A coil of wire is mounted on an axle between the poles of a horseshoe magnet, as illustrated.

In the example above, coil ABCD is horizontal and the battery is connected as shown.
a. For this position, state the direction of the force on the arm AB.
b. Why does the current in the arm BC not contribute to the turning force on the coil ?

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