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Electricity and Magnetism

22 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 22 questions

  1. A 10 μF capacitor is charged to 12 V. How much charge does it store?
  2. A 5 μF capacitor is charged to 12 V. How much energy does it store?
  3. A 10 μF capacitor is charged to 6 V. How much charge does it store?
  4. A 10 μF capacitor is charged to 100 V. How much charge does it store?
  5. A 4 μF capacitor is charged to 6 V. How much energy does it store?
  6. A 5 μF capacitor is charged to 6 V. How much charge does it store?
  7. A straight wire of length 0.2 m carries a current of 2 A perpendicular to a magnetic field of 0.5 T. What is the force on the wire?
  8. A rod of length 0.5 m moves at 10 m/s perpendicular to a magnetic field of 0.1 T. What emf is induced between its ends?
  9. A straight wire of length 0.2 m carries a current of 5 A perpendicular to a magnetic field of 0.5 T. What is the force on the wire?
  10. A rod of length 0.5 m moves at 5 m/s perpendicular to a magnetic field of 0.2 T. What emf is induced between its ends?
  11. A straight wire of length 0.5 m carries a current of 10 A perpendicular to a magnetic field of 0.1 T. What is the force on the wire?
  12. 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?
  13. A 6 V battery of negligible internal resistance is connected to a 1 Ω resistor in series with a parallel pair of 3 Ω and 6 Ω resistors. What current flows from the battery?
  14. A 24 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?
  15. A 12 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?
  16. A 24 V battery of negligible internal resistance is connected to a 1 Ω resistor in series with a parallel pair of 3 Ω and 6 Ω resistors. What current flows from the battery?
  17. A heater of resistance 5 Ω carries a current of 3 A. How much heat does it release in 120 s?
  18. A heater of resistance 5 Ω carries a current of 3 A. How much heat does it release in 60 s?
  19. A heater of resistance 4 Ω carries a current of 2 A. How much heat does it release in 300 s?
  20. Two long parallel wires carry currents in the same direction. The force between them is
  21. Lenz's law states that an induced current flows in a direction so as to
  22. A positive charge moves parallel to a uniform magnetic field. What is the magnetic force on it?

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