Exam-style question
Try this first
How does changing magnetic flux induce an electromotive force (emf)? Scenario focus: potential gradients in a distinct A-Level Physics fields context; identify the field quantity, source, direction, and unit before selecting the answer.
- A.By increasing the magnetic field strength
- B.By moving the conductor through a magnetic field
- C.According to Faraday's law of electromagnetic induction
- D.By increasing the temperature of the conductor
Model answer
What a good answer should say
- According to Faraday's law of electromagnetic induction
Explanation
Why this works
The correct answer is According to Faraday's law of electromagnetic induction. This is correct for Magnetic fields because the stem is testing potential gradients; the chosen option keeps the field quantity, source interaction, direction, and unit consistent.
The alternatives are weaker because they mix gravitational, electric, magnetic, orbital, or transformer ideas, or they attach the right number to the wrong physical meaning.
Common mistake
No common mistake is linked to this question yet.