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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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1. Test

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 electric charge quantization?

Please select an answer first.

Correct answer: A

The correct answer is Charge occurs in integer multiples of the elementary charge.

  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: Electric charge is quantized, so net charge is commonly expressed as an integer multiple of the elementary charge.
  3. Check units and direction: The correct answer is Charge occurs in integer multiples of the elementary charge.

Electric charge is quantized, so net charge is commonly expressed as an integer multiple of the elementary charge.

2. QuestionMultiple choice

What does the principle of superposition mean for electric forces?

Please select an answer first.

Correct answer: B

The correct answer is The net force is the vector sum of the forces from individual charges.

  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 multiple charges, each pairwise electric force is calculated and the vectors are added.
  3. Check units and direction: The correct answer is The net force is the vector sum of the forces from individual charges.

For multiple charges, each pairwise electric force is calculated and the vectors are added.

3. QuestionMultiple choice

What does Gauss's law relate?

Please select an answer first.

Correct answer: C

The correct answer is Electric flux through a closed surface to the enclosed charge.

  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: Gauss's law connects the total electric flux through a closed surface with the net charge inside it.
  3. Check units and direction: The correct answer is Electric flux through a closed surface to the enclosed charge.

Gauss's law connects the total electric flux through a closed surface with the net charge inside it.

4. QuestionMultiple choice

What is true about the electric field inside a conductor in electrostatic equilibrium?

Please select an answer first.

Correct answer: D

The correct answer is It 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: Free charges in a conductor redistribute until the internal electrostatic field is zero.
  3. Check units and direction: The correct answer is It is zero.

Free charges in a conductor redistribute until the internal electrostatic field is zero.

5. QuestionMultiple choice

What is an equipotential surface?

Please select an answer first.

Correct answer: A

The correct answer is A surface on which electric potential is the same at every point.

  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: Moving a test charge along an equipotential surface requires no work because the potential difference is zero.
  3. Check units and direction: The correct answer is A surface on which electric potential is the same at every point.

Moving a test charge along an equipotential surface requires no work because the potential difference is zero.

6. QuestionMultiple choice

What is capacitance?

Please select an answer first.

Correct answer: B

The correct answer is The ratio of stored charge to 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: Capacitance is defined by (C=Q/V) and depends on conductor geometry and the material between them.
  3. Check units and direction: The correct answer is The ratio of stored charge to potential difference.

Capacitance is defined by (C=Q/V) and depends on conductor geometry and the material between them.

7. QuestionMultiple choice

What does a dielectric do when inserted between capacitor plates?

Please select an answer first.

Correct answer: C

The correct answer is It increases capacitance by reducing the effective electric field for a given free charge.

  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: Polarization of a dielectric changes the electric field and allows more charge to be stored at a given voltage.
  3. Check units and direction: The correct answer is It increases capacitance by reducing the effective electric field for a given free charge.

Polarization of a dielectric changes the electric field and allows more charge to be stored at a given voltage.

8. QuestionMultiple choice

What is the energy stored in a capacitor?

Please select an answer first.

Correct answer: D

The correct answer is U=12CV2U=\frac{1}{2}CV^2.

  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 energy is the work required to charge the capacitor and can also be written as (U=Q^2/(2C)).
  3. Check units and direction: The correct answer is U=12CV2U=\frac{1}{2}CV^2.

The energy is the work required to charge the capacitor and can also be written as (U=Q^2/(2C)).

9. QuestionMultiple choice

What is an electric dipole?

Please select an answer first.

Correct answer: A

The correct answer is Two equal and opposite charges separated by a distance.

  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: An electric dipole has a dipole moment directed from the negative charge toward the positive charge.
  3. Check units and direction: The correct answer is Two equal and opposite charges separated by a distance.

An electric dipole has a dipole moment directed from the negative charge toward the positive charge.

10. QuestionMultiple choice

What do electric field lines indicate?

Please select an answer first.

Correct answer: B

The correct answer is The direction of the field for a positive test charge and relative field strength.

  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: Field-line density represents relative field strength, and the tangent gives the field direction.
  3. Check units and direction: The correct answer is The direction of the field for a positive test charge and relative field strength.

Field-line density represents relative field strength, and the tangent gives the field direction.

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