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?
Question: 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?
To demonstrate the existence of a magnetic field around a wire carrying current, a simple instrument called a galvanometer can be used. A galvanometer is a type of device that measures electrical current and is based on the principle of magnetic induction. When a current is passed through a wire, it creates a magnetic field around the wire, which can be detected by the coil inside the galvanometer. The deflection of the needle in the galvanometer indicates the strength and direction of the magnetic field.
The deflection of a compass needle when brought near a bar magnet is due to the interaction between the magnetic field of the bar magnet and the magnetic field of the Earth. A compass needle contains a small magnet that aligns itself with the Earth's magnetic field. When a bar magnet is brought near the compass, it creates its own magnetic field that interacts with the Earth's magnetic field and causes the compass needle to deviate from its original position. The direction and strength of the deviation depend on the orientation and strength of the magnetic field of the bar magnet.
In summary, a galvanometer can be used to show that a magnetic field exists around a wire carrying current, while the deflection of a compass needle near a bar magnet is due to the interaction between the magnetic field of the bar magnet and the Earth's magnetic field.
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