O-LevelPhysicsMagnetism5054/11 · May/June 2015 · Q361 Mark

A magnet is placed near to a solenoid that is connected to a sensitive centre-zero ammeter. The magnet is pushed towards the solenoid. It accelerates, then moves at constant speed, then decelerates and stops inside the solenoid. When is the reading on the ammeter zero?

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Awhen the magnet is accelerating

Bwhen the magnet is moving at constant speed

Cwhen the magnet is decelerating

Dwhen the magnet is stationary

✓ Correct answer

D: when the magnet is stationary

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