Name: Working of an Electric Bell
Uploaded: 2019-07-19
Duration: 4 min 44 s
Description: Electromagnets form the base of many common devices, including an electric bell. Let’s open up one such electric bell to see how it works in this video.

Question

How can you show that an electric current has a magnetic effect?

Accepted Answer

We have to observe the magnetic effect of current passing through a wire. For this, we require a $1.5 V$ cell, two pieces of insulated wire, a small magnetic compass, and an insulation tape. First, we have to strip the insulation from the two ends of both the wires. Then we have to connect one end of one of the wires to the negative terminal of the cell. We have to secure the connection with the insulation tape. Next, connect one end of the other wire to the positive terminal of the cell. Secure the connection with the insulation tape. Then place the magnetic compass near the wire. Keep an eye on the needle of the magnetic compass and touch the free ends of the wires connected to the positive and negative terminals of the cell. We can see that when we touch the wire to the positive terminal of the cell, the needle of the magnetic compass gets deflected (moves). This is because when a current passes through the wire, it behaves like a magnet and therefore deflects the magnetic needle of the compass. It is the magnetism produced by current-carrying wire which is exerting a force on the compass needle and deflecting it from its usual north-south position.

How can you show that an electric current has a magnetic effect?

Important Questions on Electric Current and Circuits

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