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Electricity and Magnetism Practice Tests

These Grade 12 Science practice tests develop Electricity and Magnetism skills through charge, electric fields, potential, capacitors, circuits, magnetic fields, induction, alternating current, electromagnetic waves, and electrical safety.

Skills covered

  • Applying charge quantization, superposition, Gauss's law, conductors, equipotential surfaces, dipoles, and capacitors
  • Analyzing current, resistance, Ohm's law, Kirchhoff's rules, RC circuits, AC values, transformers, power, and real sources
  • Using Lorentz force, right-hand rules, solenoids, cyclotrons, magnetic dipoles, Hall effect, Biot–Savart law, and Ampère's law
  • Explaining Faraday's law, Lenz's law, motional emf, inductance, RLC resonance, impedance, phase, generators, and eddy currents
  • Interpreting Maxwell's ideas, electromagnetic waves, polarization, spectrum, MRI, grounding, GFCI protection, and multimeter safety

How to use these practice tests

Sketch the field, circuit, or motion before calculating. Mark current directions and potential changes, keep vector directions consistent, and use the explanations to connect formulas with conservation of charge, energy, and electromagnetic flux.

For more Grade 12 Science practice, return to the Grade 12 Science category.

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Grade 12 Electricity and Magnetism Practice Tests

Practice Grade 12 Science questions about electric charge, fields, capacitors, circuits, magnetic fields, induction, alternating current, electromagnetic waves, and electrical safety.

Choose the best answer. Draw field or circuit diagrams when useful, track signs and units, and identify the conservation law or field relationship involved.

10 Questions
0/10 Questions0 %
Correct 0
Incorrect 0
Unanswered 10
1. QuestionMultiple choice

What is current density?

Please select an answer first.

Correct answer: A

The correct answer is Electric current per unit cross-sectional area.

  1. Identify the electricity and magnetism concept: Determine whether the question concerns charge, fields, circuits, magnetism, induction, alternating current, electromagnetic waves, or measurement.
  2. Apply the governing relationship: Current density describes how much current passes through a unit area and is represented by (J=I/A) for a uniform distribution.
  3. Check units and direction: The correct answer is Electric current per unit cross-sectional area.

Current density describes how much current passes through a unit area and is represented by (J=I/A) for a uniform distribution.

2. QuestionMultiple choice

What is drift velocity in a metal wire?

Please select an answer first.

Correct answer: B

The correct answer is The average directed velocity of charge carriers caused by an electric field.

  1. Identify the electricity and magnetism concept: Determine whether the question concerns charge, fields, circuits, magnetism, induction, alternating current, electromagnetic waves, or measurement.
  2. Apply the governing relationship: Electrons have random microscopic motion, but an applied field produces a small average drift responsible for current.
  3. Check units and direction: The correct answer is The average directed velocity of charge carriers caused by an electric field.

Electrons have random microscopic motion, but an applied field produces a small average drift responsible for current.

3. QuestionMultiple choice

How does the resistance of a typical metal change as temperature increases?

Please select an answer first.

Correct answer: C

The correct answer is It generally increases.

  1. Identify the electricity and magnetism concept: Determine whether the question concerns charge, fields, circuits, magnetism, induction, alternating current, electromagnetic waves, or measurement.
  2. Apply the governing relationship: Higher lattice vibration generally increases electron scattering in a metal, raising its resistance.
  3. Check units and direction: The correct answer is It generally increases.

Higher lattice vibration generally increases electron scattering in a metal, raising its resistance.

4. QuestionMultiple choice

In a parallel circuit, what is the same across each ideal branch?

Please select an answer first.

Correct answer: D

The correct answer is The potential difference.

  1. Identify the electricity and magnetism concept: Determine whether the question concerns charge, fields, circuits, magnetism, induction, alternating current, electromagnetic waves, or measurement.
  2. Apply the governing relationship: Parallel branches connect to the same two nodes, so they share the same voltage while currents may differ.
  3. Check units and direction: The correct answer is The potential difference.

Parallel branches connect to the same two nodes, so they share the same voltage while currents may differ.

5. QuestionMultiple choice

What does Kirchhoff's loop rule express?

Please select an answer first.

Correct answer: A

The correct answer is The algebraic sum of potential changes around a closed loop is zero.

  1. Identify the electricity and magnetism concept: Determine whether the question concerns charge, fields, circuits, magnetism, induction, alternating current, electromagnetic waves, or measurement.
  2. Apply the governing relationship: The loop rule follows from conservation of energy in a circuit.
  3. Check units and direction: The correct answer is The algebraic sum of potential changes around a closed loop is zero.

The loop rule follows from conservation of energy in a circuit.

6. QuestionMultiple choice

What is the time constant of a simple RC circuit?

Please select an answer first.

Correct answer: B

The correct answer is τ=RC\tau=RC.

  1. Identify the electricity and magnetism concept: Determine whether the question concerns charge, fields, circuits, magnetism, induction, alternating current, electromagnetic waves, or measurement.
  2. Apply the governing relationship: The product of resistance and capacitance sets the characteristic charging or discharging time.
  3. Check units and direction: The correct answer is τ=RC\tau=RC.

The product of resistance and capacitance sets the characteristic charging or discharging time.

7. QuestionMultiple choice

What does RMS voltage represent in an AC circuit?

Please select an answer first.

Correct answer: C

The correct answer is The DC voltage that would deliver the same average power to a resistor.

  1. Identify the electricity and magnetism concept: Determine whether the question concerns charge, fields, circuits, magnetism, induction, alternating current, electromagnetic waves, or measurement.
  2. Apply the governing relationship: For a sinusoidal voltage, the RMS value is related to the peak value and gives the equivalent heating effect in a resistor.
  3. Check units and direction: The correct answer is The DC voltage that would deliver the same average power to a resistor.

For a sinusoidal voltage, the RMS value is related to the peak value and gives the equivalent heating effect in a resistor.

8. QuestionMultiple choice

What does an ideal transformer change?

Please select an answer first.

Correct answer: D

The correct answer is Voltage and current levels through electromagnetic induction while conserving power approximately.

  1. Identify the electricity and magnetism concept: Determine whether the question concerns charge, fields, circuits, magnetism, induction, alternating current, electromagnetic waves, or measurement.
  2. Apply the governing relationship: A transformer changes voltage according to its turns ratio and changes current inversely in the ideal model.
  3. Check units and direction: The correct answer is Voltage and current levels through electromagnetic induction while conserving power approximately.

A transformer changes voltage according to its turns ratio and changes current inversely in the ideal model.

9. QuestionMultiple choice

What is electrical power delivered to a resistor?

Please select an answer first.

Correct answer: A

The correct answer is P=IVP=IV.

  1. Identify the electricity and magnetism concept: Determine whether the question concerns charge, fields, circuits, magnetism, induction, alternating current, electromagnetic waves, or measurement.
  2. Apply the governing relationship: Electrical power is the rate of energy transfer and can also be written as (I^2R) or (V^2/R).
  3. Check units and direction: The correct answer is P=IVP=IV.

Electrical power is the rate of energy transfer and can also be written as (I^2R) or (V^2/R).

10. QuestionMultiple choice

What is the terminal voltage of a real battery under load?

Please select an answer first.

Correct answer: B

The correct answer is Its emf minus the voltage drop across its internal resistance.

  1. Identify the electricity and magnetism concept: Determine whether the question concerns charge, fields, circuits, magnetism, induction, alternating current, electromagnetic waves, or measurement.
  2. Apply the governing relationship: A real source has internal resistance, so current causes an internal voltage drop and lowers the terminal voltage.
  3. Check units and direction: The correct answer is Its emf minus the voltage drop across its internal resistance.

A real source has internal resistance, so current causes an internal voltage drop and lowers the terminal voltage.

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