General Education Diploma (GED Oman) · Physics And Chemistry

Electricity and Magnetism

12 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 12 questions

  1. A 5 μF capacitor is charged to 100 V. How much energy does it store?
  2. A 2 μF capacitor is charged to 10 V. How much energy does it store?
  3. A 4 μF capacitor is charged to 12 V. How much energy does it store?
  4. A 5 μF and a 2 μF capacitor are connected in series. What is the combined capacitance?
  5. A 4 μF capacitor is charged to 20 V. How much energy does it store?
  6. A rod of length 0.5 m moves at 5 m/s perpendicular to a magnetic field of 0.1 T. What emf is induced between its ends?
  7. A rod of length 0.5 m moves at 2 m/s perpendicular to a magnetic field of 0.5 T. What emf is induced between its ends?
  8. A straight wire of length 0.2 m carries a current of 10 A perpendicular to a magnetic field of 0.1 T. What is the force on the wire?
  9. A 6 V battery of negligible internal resistance is connected to a 4 Ω resistor in series with a parallel pair of 3 Ω and 6 Ω resistors. What current flows from the battery?
  10. A 24 V battery of negligible internal resistance is connected to a 4 Ω resistor in series with a parallel pair of 6 Ω and 3 Ω resistors. What current flows from the battery?
  11. A 6 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?
  12. A heater of resistance 20 Ω carries a current of 2 A. How much heat does it release in 60 s?

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