NumicornNumicornLearn, solve, progress

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.

Select a test

5 Tests
1. Test2. Test3. Test4. Test5. Test

4. 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 does Faraday's law state?

Please select an answer first.

Correct answer: A

The correct answer is The induced emf is related to the negative rate of change of magnetic flux.

  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: Faraday's law is expressed as (\mathcal{E}=-d\Phi_B/dt), where the changing flux produces an induced emf.
  3. Check units and direction: The correct answer is The induced emf is related to the negative rate of change of magnetic flux.

Faraday's law is expressed as (\mathcal{E}=-d\Phi_B/dt), where the changing flux produces an induced emf.

2. QuestionMultiple choice

What does Lenz's law determine?

Please select an answer first.

Correct answer: B

The correct answer is The induced current opposes the change in magnetic flux that produces it.

  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 negative sign in Faraday's law represents the direction required by conservation of energy.
  3. Check units and direction: The correct answer is The induced current opposes the change in magnetic flux that produces it.

The negative sign in Faraday's law represents the direction required by conservation of energy.

3. QuestionMultiple choice

What produces motional emf in a moving conductor?

Please select an answer first.

Correct answer: C

The correct answer is A conductor moving through a magnetic field so charge experiences magnetic force.

  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: Charges in a moving conductor experience (qmathbf{v}\timesmathbf{B}), which can separate charge and create an emf.
  3. Check units and direction: The correct answer is A conductor moving through a magnetic field so charge experiences magnetic force.

Charges in a moving conductor experience (qmathbf{v}\timesmathbf{B}), which can separate charge and create an emf.

4. QuestionMultiple choice

What is self-inductance?

Please select an answer first.

Correct answer: D

The correct answer is The tendency of a circuit to oppose changes in its own current.

  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 changing current changes the circuit's own magnetic flux and induces an emf that opposes the current change.
  3. Check units and direction: The correct answer is The tendency of a circuit to oppose changes in its own current.

A changing current changes the circuit's own magnetic flux and induces an emf that opposes the current change.

5. QuestionMultiple choice

What is the time constant of an RL circuit?

Please select an answer first.

Correct answer: A

The correct answer is τ=L/R\tau=L/R.

  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: Inductance divided by resistance sets the characteristic time for current growth or decay in an RL circuit.
  3. Check units and direction: The correct answer is τ=L/R\tau=L/R.

Inductance divided by resistance sets the characteristic time for current growth or decay in an RL circuit.

6. QuestionMultiple choice

At resonance in an ideal series RLC circuit, what happens?

Please select an answer first.

Correct answer: B

The correct answer is The inductive and capacitive reactances cancel.

  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: At resonance, (X_L=X_C), so the net reactance is zero and the impedance is minimized to the resistance.
  3. Check units and direction: The correct answer is The inductive and capacitive reactances cancel.

At resonance, (X_L=X_C), so the net reactance is zero and the impedance is minimized to the resistance.

7. QuestionMultiple choice

What is impedance in an AC circuit?

Please select an answer first.

Correct answer: C

The correct answer is The total opposition to alternating current, including resistance and reactance.

  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: Impedance combines resistive and reactive effects and determines AC current through the relationship (I=V/Z).
  3. Check units and direction: The correct answer is The total opposition to alternating current, including resistance and reactance.

Impedance combines resistive and reactive effects and determines AC current through the relationship (I=V/Z).

8. QuestionMultiple choice

In a purely inductive AC circuit, how does current phase compare with voltage?

Please select an answer first.

Correct answer: D

The correct answer is Current lags voltage by 90 degrees.

  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 inductor resists changing current, producing a phase relationship in which current lags the voltage.
  3. Check units and direction: The correct answer is Current lags voltage by 90 degrees.

An inductor resists changing current, producing a phase relationship in which current lags the voltage.

9. QuestionMultiple choice

What are eddy currents?

Please select an answer first.

Correct answer: A

The correct answer is Circulating currents induced inside a conducting material by changing magnetic flux.

  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: Eddy currents can cause heating, damping, and energy loss, but they are also useful in brakes and induction heating.
  3. Check units and direction: The correct answer is Circulating currents induced inside a conducting material by changing magnetic flux.

Eddy currents can cause heating, damping, and energy loss, but they are also useful in brakes and induction heating.

10. QuestionMultiple choice

What does an AC generator convert?

Please select an answer first.

Correct answer: B

The correct answer is Mechanical energy into electrical energy through electromagnetic induction.

  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 generator rotates conductors or magnetic fields so the changing flux induces an alternating emf.
  3. Check units and direction: The correct answer is Mechanical energy into electrical energy through electromagnetic induction.

A generator rotates conductors or magnetic fields so the changing flux induces an alternating emf.

Previous testNext test