A conducting coil with its plane perpendicular to a uniform magnetic field is moved at constant speed in the field region, the induced emf in the coil is:
Correct answer: B. constant
- A. zero
- B. constant
- C. increasing
- D. decreasing
Explanation
This is the option marked correct in the official UHS answer key. By Faraday's law the emf depends on the rate of change of magnetic flux, and a coil moved at constant speed while it remains wholly inside a uniform field keeps the same flux through it, so standard reasoning gives an induced emf of zero. A constant emf is produced only while the coil is entering or leaving the field region, where the flux changes at a steady rate, which is the reading the key takes.
This question appeared on the UHS MDCAT 2026 paper, which you can sit online with every answer explained.
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About Faraday's Law
Faraday's law states that an induced electromotive force equals the rate of change of magnetic flux linkage through a circuit. Questions cover changing field, area, angle or motion, the negative sign associated with Lenz's law, and the distinction between induced emf and the current that may flow in a closed circuit.
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