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PY106 Notes - Applications of electromagnetic induction
Topics include eddy currents, the electric generator, back EMF in electric motors, mutual inductance, self inductance, and transformers.

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Special points of emphasis

DC Current

Electomagnetic Induction

We tend to view DC circuits in terms of their steady state values, but induced EMF can be important when the current is changing even in a mundane looking circuit. When the switch in a circuit is closed and current begins to flow, the current produces a magnetic flux through the loop. This magnetic flux changes with time, increasing and inducing an EMF in the circuit that opposes the change in magnetic flux. The opposing EMF, the back EMF, results in the current increasing gradually.

Watch the phrasing in the passage and question. If the MCAT were going to be tricky about back EMF in a standard DC circuit, there would certainly be mention in the passage of induction.

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