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Magnetism and electromagnetism

Magnetism and electromagnetism

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Question 22

An emergency safety beacon is powered by shaking. When shaken by a user, a permanent magnet slides back and forth through a stationary coil of wire.

a.

Explain why a voltage is induced across the ends of the coil when the magnet moves through it.

[2]
b.

State one way to increase the magnitude of the induced voltage.

[1]
c.

The beacon uses a light-emitting diode (LED) to provide light. When the LED is illuminated, it shows that:

  • A. there is an electric current flowing through the circuit.
  • B. the battery inside is completely uncharged.
  • C. there is a short-circuit fault in the wiring.
  • D. the current is alternating at a very high frequency.
[1]
d.

The manufacturer states, "The LED is a more efficient light source than a traditional filament indicator bulb." Explain this statement in terms of energy transfers.

[2]
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Magnetism and electromagnetism Questions

  1. IGCSE
  2. /Physics
  3. /Magnetism and electromagnetism

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