Magnetism & Induction

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7 Terms

1
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What are natural magnets called?

Lodestones (magnetite rocks)

2
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List three magnetic materials

Iron, Nickel, Cobalt

3
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State the two laws of magnetism

Like poles repel; unlike poles attract

4
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What is Faraday’s Law of electromagnetic induction?

The induced EMF in a coil is proportional to the rate of change of magnetic flux.

5
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How does Lenz’s Law relate to induced EMF?

The induced EMF opposes the change causing it (conservation of energy).

6
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What determines the strength of an electromagnet?

Current magnitude and number of coil turns.

7
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A 0.5m conductor moves at 3 m/s perpendicular to a 2 Tesla magnetic field. Calculate induced EMF.

e = B x l x v = 2 × 0.5 × 3 = 3V