What is electromagnet?

Academic Physics NCERT Class 8

Unlike a normal magnet, an electromagnet is a magnet that runs on when electricity is passed through it. Its strength can be changed by varying the amount of electricity passed through it. It is even possible to change the poles by changing the direction of the electricity flowing through the magnet.

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Updated on: 10-Oct-2022

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(a) What is an electromagnet? List any two uses.(b) Draw a labelled diagram to show how an electromagnet is made.(c) State the purpose of soft iron core used in making an electromagnet.(d) List two ways of increasing the strength of an electromagnet if the material of the electromagnet is fixed.
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(a) What is an electromagnet? Describe the construction and working of an electromagnet with the help of a labelled diagram.(b) Explain why, an electromagnet is called a temporary magnet. (c) Explain why, the core of an electromagnet should be of soft iron and not of steel. (d) State the factors on which the strength of an electromagnet depends. How does it depend on these factors? (e) Write some of the important uses of electromagnets.
The strength of the magnetic field between the poles of an electromagnet would be unchanged if:(a) current in the electromagnet winding were doubled (b) direction of current in electromagnet winding were reversed (c) distance between the poles of electromagnet were doubled (d) material of the core of electromagnet were changed
Boojho made an electromagnet by winding 50 turns of wire over an iron screw. Paheli also made an electromagnet by winding 100 turns over a similar iron screw. Which electromagnet will attract more pins? Give reason.
Under what conditions permanent electromagnet is obtained if a current carrying solenoid is used? Support your answer with the help of a labelled circuit diagram.
The direction of current in the coil at one end of an electromagnet is clockwise. This end of the electromagnet will be:(a) north pole (b) east pole (c) south pole (d) west pole
Does the thickness of the wire affect the strength of the electromagnet?
State three ways in which the strength of an electromagnet can be increased.
On which factor does the strength of the magnetic field in an electromagnet depend?
The most suitable material for making the core of an electromagnet is:(a) soft iron (b) brass (c) aluminium (d) steel
(a) Draw a circuit diagram to show how a soft iron piece can be transformed into an electromagnet.(b) Describe how an electromagnet could be used to separate copper from iron in a scrap yard.
Do you think an electromagnet can be used for separating plastic bags from a garbage heap? Explain.
The direction of current flowing in the coil of an electromagnet at its two ends X and Y are as shown below: (a) What is the polarity of end X? (b) What is the polarity of end Y? (c) Name and state the rule which you have used to determine the polarities."\n

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