Report Sheet Lab 7 Electromagnetic Induction - Answers

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Report Sheet ELECTROMAGNETIC INDUCTION (LAB 7) 1. Explain the rationale you used to construct your predictions in Tables 2 and 3 (in the lab write-up). Did your predictions match your results? The predictions for the current readings in the tables were based on the principle that the induced current in a coil is proportional to the rate of change of magnetic flux. This was anticipated to increase with the speed of the magnet’s motion, and to be higher with greater number of magnets. 2. Do your results support Faraday’s Law? Use your results to explain your answer. My results supported Faraday’s Law if an increase in the magnet’s speed or the number of magnets resulted in a higher current reading. The induced current was expected to be directly proportional to the rate of change of magnetic flux, which would be greater for faster-moving magnets and a larger number of magnets. 3. What do you predict will happen to the maximum current if you used the same magnet, moving at the same speed, but increased the radius of the loop?

Increasing the radius of the loop was predicted to increase the induced current. A larger loop area would lead to a greater magnetic flux for the same magnetic field strength and, by Faraday’s Law, a higher induced current if the magnet’s speed remained constant. 4. What do you predict will happen if you used the same magnet, moving at the same speed, but through a coil with less loops? A coil with fewer loops would induce less current for the same motion of the same magnet. Faraday’s Law indicates that the induced EMF (and thus the current) is proportional to the number of turns in the coil. Fewer turns would mean less change in magnetic flux and a lower induced current. 5. Estimate the change in flux for one of your results in Table 1 (in the lab-write-up). Note : Resistance of a wire is equal to ρL/ A and the resistivity of copper is 1.68 x 10 -8 Ω*m.

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