Leaving Cert Ireland · Physics

Electricity and Magnetism

9 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 9 questions

  1. A current of 0.5 A flows through a 12 Ω resistor. What is the potential difference across it?
  2. Resistors of 2 Ω, 12 Ω and 12 Ω are connected in series. What is the total resistance?
  3. Resistors of 2 Ω, 3 Ω and 4 Ω are connected in series. What is the total resistance?
  4. A 2 μF capacitor is charged to 100 V. How much energy does it store?
  5. A 10 μF capacitor is charged to 12 V. How much energy does it store?
  6. A rod of length 0.2 m moves at 10 m/s perpendicular to a magnetic field of 0.5 T. What emf is induced between its ends?
  7. A 24 V battery of negligible internal resistance is connected to a 1 Ω resistor in series with a parallel pair of 6 Ω and 3 Ω resistors. What current flows from the battery?
  8. A 24 V battery of negligible internal resistance is connected to a 1 Ω resistor in series with a parallel pair of 12 Ω and 4 Ω resistors. What current flows from the battery?
  9. A heater of resistance 4 Ω carries a current of 5 A. How much heat does it release in 120 s?

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