Question

What is an electromagnet?

April 3, 2024

Answer

An electromagnet is a temporary strong magnet made from a piece of soft iron when current flows in the coil wound around it. It is an artificial magnet.

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Show with the aid of a diagram how a wire is wound on a U-shaped piece of soft iron in order to make it an electromagnet. Complete the circuit diagram and label the poles of the electromagnet.

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State two differences between an electromagnet and a permanent magnet.

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You are required to make an electromagnet from a soft iron bar by using a cell, an insulated coil of copper wire and a switch. (a) Draw a circuit diagram to represent the process. (b) Label the poles of the electromagnet.

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How is an electromagnet made? Name two factors on which the strength of the magnetic field of an electromagnet depends.

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Name the material used for making the armature of an electric bell. Give a reason for your answer.

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How is the working of an electric bell affected, if alternating current is used instead of direct current?

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State two advantages of an electromagnet over a permanent magnet.

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State two ways through which the strength of an electromagnet can be increased.

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Figure shows a coil wound around a soft iron bar XY. (a) State the polarity at the end X and Y as the switch is pressed. (b) Suggest one way of increasing the strength of the electromagnet so formed.

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Why is soft iron used as the core of the electromagnet in an electric bell?

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Question

What is an electromagnet?

Answer

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