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प्रश्न
What is an electromagnet? What do you know about the simplest form of an electromagnet?
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उत्तर
The electromagnet is a temporary magnet which can be magnetized or demagnetized in a very short time as per our requirements. In the simplest form, an electromagnet consists simply of a soft iron core around which a large number of turns of insulated wire are wound. Two of the simple forms of an electro magnet are shown in the figure alongside.
संबंधित प्रश्न
The device used for producing electric current is called _________.
An induced current is produced when a magnet is moved into a coil. The magnitude of induced current does not depend on:
(a) the speed with which the magnet is moved
(b) the number of turns of the coil
(c) the resistivity of the wire of the coil
(d) the strength of the magnet
Draw a simple labeled diagram of a step-up transformer.
Draw a labelled diagram to show how an electromagnet is made.
Using Ampere's law, obtain an expression for the magnetic induction near a current-carrying straight infinitely long wire.
What for an inductor is used? Give some examples.
A 50 cm long solenoid has 400 turns per cm. The diameter of the solenoid is 0.04 m. Find the magnetic flux linked with each turn when it carries a current of 1 A.
A layer of atmosphere that reflects medium frequency radio waves which is ineffective during night, is ______.
Name some equipment that uses electromagnetism for functioning.
