Which instrument can be used to show that magnetic field exists around a wire carrying current? Why does a compass needle get deflected when brought near a bar magnet? [3 MARKS]
Each point: 1.5 Mark
1. By using magnetic compass which shows deflection when brought in external magnetic field we can show magnetic field exists around a wire carrying current.
2. When a compass needle is brought near a bar magnet, the compass needle experiences a deflection. This happens because of interaction of magnetic fields of the compass needle and the bar magnet.