Grade 11 Physical Sciences · Electricity and Magnetism

State electromagnetism laws and definitions

State Faraday's law in full, or define magnetic flux, rms voltage or rms current.

past paper questions use it: 6 past paper questions use it
videos: 3 videos

Learn it: state electromagnetism laws and definitions

Pick one and watch it, then try the questions below. Videos load only when you tap play.

Grade 11 Electromagnetism Faraday's Law of Electromagnetic InductionMiss Martins Maths and Science

Electromagnetism grade 11 Lesson 4: Faradays LawKevinmathscience

Now try it on a real exam question

No sign-up. Takes 3 minutes.

Question 9.1 · November 2025 · Paper 1 · National (DBE) · 2 marks

An AC generator operates a fan. The directions of the rotation of the coil and the induced current are shown in the simplified diagram below. Diagram for this question

9.1 Define the term rms potential difference.(2)

Work it out on paper first. Then mark yourself with the official memo, one tick at a time.

More past paper questions: state electromagnetism laws and definitions

Work each one out first, then open the memo and check every tick.

3. Question 9.2.1 · May/June 2025 · Paper 1 · National (DBE) · 2 marks
9.2 An AC generator produces a maximum output voltage of $340$ V. A $1200$ W electric kettle operates optimally when it is connected to this generator.

Answer the questions that follow.
9.2.1 Define the term root mean square current.(2)
Show the memo (1 tick)Memo
1. ✓
  Definition of rms currentRoot-mean-square current is the alternating current (AC) that dissipates the same amount of energy/heating effect as an equivalent direct current (DC).
  2 marks · State electromagnetism laws and definitions
4. Question 9.3 · May/June 2024 · Paper 1 · National (DBE) · 2 marks
The simplified diagram below represents an AC generator with a coil rotating clockwise. X and Y are two points in the external circuit.
The maximum voltage produced by the generator is $125$ V.
9.3 Define the term root mean square voltage.(2)
Show the memo (1 tick)Memo
1. ✓
  Definition of rms voltageThe rms potential difference is the alternating current potential difference which dissipates/produces the same amount of energy/heating effect as an equivalent DC potential difference.
  2 marks · State electromagnetism laws and definitions
5. Question 9.2.1 · November 2023 · Paper 1 · National (DBE) · 2 marks
9.2 The circuit diagram below shows an electric kettle and a toaster connected to an AC source with an rms voltage of $220$ V. The ammeter, connecting wires and switches S $_{1}$ and S $_{2}$ have negligible resistance.

Answer the questions that follow.
9.2.1 Define the term root mean square current.(2)
Show the memo (1 tick)Memo
1. ✓
  Definition of rms currentRoot-mean-square current is the alternating current (AC) that dissipates the same amount of energy/heating effect as an equivalent direct current (DC) current.
  2 marks · State electromagnetism laws and definitions
6. Question 8.3.1 · November 2025 · Paper 1 · Provincial · 2 marks
The north pole of a magnet is pushed into a solenoid as shown in the diagram below.
8.3 A coil with $350$ turns has an area of $0, 08$ m $^{2}$ . It is held with its axis coinciding with the direction of a magnetic field of strength $0, 6$ T. In order to induce an emf in the coil, it is pulled out of the magnetic field in $0, 25$ seconds.

Answer the following questions.
8.3.1 State Faraday's law of electromagnetic induction.(2)
Show the memo (1 tick)Memo
1. ✓
  Faraday's lawThe magnitude of the induced emf across the end of a conductor is directly proportional to the rate of change in the magnetic flux linkage with the conductor.
  2 marks · State electromagnetism laws and definitions

Free on Android

Know exactly which skill is costing you marks.

Mark past papers tick by tick in the NavyBlue app. It remembers every mark you lose, shows you the skills to fix first, and picks your next questions.

The NavyBlue app showing a learner's weak skills