Wazari Exam (Iraq Baccalaureate) - Scientific Branch · Physics

Electricity and magnetism

23 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 23 questions

  1. A 9 V battery is connected across a 3 ohm resistor. What current flows?
  2. A 10 ohm and a 15 ohm resistor are connected in parallel. What is the combined resistance?
  3. A cell of e.m.f. 12 V and internal resistance 1 ohm is connected to an external resistor of 5 ohm. What is the potential difference across the external resistor?
  4. A cell of e.m.f. 24 V and internal resistance 2 ohm is connected to an external resistor of 10 ohm. What is the potential difference across the external resistor?
  5. A cell of e.m.f. 20 V and internal resistance 2 ohm is connected to an external resistor of 8 ohm. What is the potential difference across the external resistor?
  6. A 6 ohm heater is connected to a 12 V supply. What power does it dissipate?
  7. A 50 ohm heater is connected to a 100 V supply. What power does it dissipate?
  8. A 50 microfarad capacitor is charged to 20 V. How much energy does it store (in microjoules)?
  9. A 10 microfarad capacitor is charged to 100 V. How much energy does it store (in microjoules)?
  10. A 22 microfarad capacitor is charged to 50 V. How much energy does it store (in microjoules)?
  11. Two capacitors of 4 microfarad and 6 microfarad are connected in series. What is the total capacitance?
  12. Two capacitors of 10 microfarad and 15 microfarad are connected in series. What is the total capacitance?
  13. A straight wire 0.333 m long carries 10 A at right angles to a magnetic field of 0.3 T. What is the force on the wire?
  14. A straight wire 0.4 m long carries 5 A at right angles to a magnetic field of 0.6 T. What is the force on the wire?
  15. A rod 0.667 m long moves at 5 m/s at right angles to a uniform magnetic field of 0.3 T. What e.m.f. is induced across its ends?
  16. An inductor of 0.1 H is connected to a 50 Hz supply. What is its reactance, to the nearest ohm? (Use pi = 3.14)
  17. An inductor of 0.2 H is connected to a 100 Hz supply. What is its reactance, to the nearest ohm? (Use pi = 3.14)
  18. An inductor of 0.3 H is connected to a 50 Hz supply. What is its reactance, to the nearest ohm? (Use pi = 3.14)
  19. In a series AC circuit R = 40 ohm, = 40 ohm and = 10 ohm. What is the impedance?
  20. In a series AC circuit R = 40 ohm, = 50 ohm and = 20 ohm. What is the impedance?
  21. In a series AC circuit R = 36 ohm, = 60 ohm and = 12 ohm. What is the impedance?
  22. In a series AC circuit R = 15 ohm, = 25 ohm and = 5 ohm. What is the impedance?
  23. In a series AC circuit R = 27 ohm, = 45 ohm and = 9 ohm. What is the impedance?

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