O-LevelPhysicsMagnetism5054/11 · May/June 2013 · Q361 Mark
Two leads emerging from a box are connected to a sensitive ammeter. When a bar magnet moves towards the open end of the box, the needle of the ammeter deflects to the right. When the bar magnet stops, the needle returns to zero. What is inside the box?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Acoil alone
Bcoil connected in series with a cell
Clight-dependent resistor (LDR) alone
Dan LDR in series with a cell
✓ Correct answer
A: coil alone
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