# lab 9 - Matt Weiner Phys 241 Lab 9 The Electric Motor Goal...

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Matt Weiner Phys. 241 10/31/06 Lab 9 The Electric Motor Goal: To design and build an electric motor. Then to test the motor in various ways. Theory: The force of the motor is caused by a charging particle moving in a magnetic field. If we look at figure 1, there is a wire with length L and carries a current I through a magnetic field. The wire has a force: B x L i F = (1) The torque is the work done by the motor. The formula for torque is the maximum for the force of the motor: r x F = τ (2) Fig. 1 Procedure: The first part of the lab was to build an electric motor. This was done by following the steps in the lab manual and the figure 2. We first cut out the motor frame and the wire mount. We then put the stiff wire in the center as an axle. We then put a coil wire on the axle and a magnet under the coil. We then put a current through the wire. With a magnetic field from the magnet and the current though the wire, the coil rotated like a motor. Fig. 2

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lab 9 - Matt Weiner Phys 241 Lab 9 The Electric Motor Goal...

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