Electro Magnet
Electromagnet
It is magnet made by using electric current. An electromagnet works on the principal of magnetic effect of the current. Wrap a wire around a soft iron piece (known as the core). A magnet made using such an arrangement is called an electromagnet. A solenoid is a device which can be used as an electromagnet.
Construction of Solenoid :
It is made of a long wire that has been wound many times (usually around a hollow metallic core). It has the shape of a long cylinder.
The more the number of turns of wire around the core the more will be the magnetic effect. The iron nail attracts more number of safety pins when wrapped with a coil with more number of turns. If the current passing through the coil is switched off then the iron piece will lose its magnetic effect, i.e., it will stop behaving like a magnet such magnet are called temporary magnets because they behave as a magnet as long as electricity flows through them.
Which of the following are correct ? (a) A solenoid is a device which can be used as an permanent magnet. (b) By increasing the number of turns in the coil and by increasing the current passing through the coil, an electromagnet can be made very strong . | |||
| Right Option : B | |||
| View Explanation | |||
A magnet made passing an electric current through a wire wrapped around a soft iron piece is called an _______________. | |||
| Right Option : A | |||
| View Explanation | |||
The branch of physics which deals with the magnetism produced due to electric current is called ___________________ | |||
| Right Option : B | |||
| View Explanation | |||
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