A physics student in St. Lucia connects a galvanometer to a coil of wire and moves a bar magnet towards the coil. She notices that the galvanometer needle deflects. Which of the following would cause the needle to deflect in the OPPOSITE direction?

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Question

A physics student in St. Lucia connects a galvanometer to a coil of wire and moves a bar magnet towards the coil. She notices that the galvanometer needle deflects. Which of the following would cause the needle to deflect in the OPPOSITE direction?

Accepted Answer

Moving the magnet away from the coil — Award 1 mark for understanding that reversing the direction of relative motion reverses the induced current direction (Lenz's law). A is incorrect — faster movement increases magnitude, not direction. B is incorrect — no deflection occurs when stationary. D is incorrect — a stronger magnet increases current but doesn't reverse it.

Answer

Holding the magnet stationary inside the coil

Answer

Using a stronger magnet moving in the same direction

Answer

Moving the magnet away from the coil

Answer

Moving the same pole of the magnet towards the coil faster

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