Electromagnet
Electromagnet: Overview
This Topic covers sub-topics such as Electromagnet, Application of Electromagnet and, Mechanism of Electromagnet
Important Questions on Electromagnet
Which of these are not properties of electromagnets?
(i) An increase in current increases its strength.
(ii) They are permanent magnets.
(iii) They remain magnetised even after the current is switched off.
(iv) They are of varying shapes and sizes.
A long coil made up of a number of turns of an insulated wire is called a (an) _____. (Solenoid/Bar magnet)
What is an electromagnet? Give three uses of electromagnets.
State whether the given statement is True or False. Correct the false statement.
An electromagnet acts as a magnet even when there is no current passing through it.
An _____ behaves like a magnet only when an electric current passes through it.
Which of these appliances uses an electromagnet?
What do you mean by electromagnet? Write its uses.
A device which gets temporarily magnetised on passing an electric current is called an electromagnet.
_____ is a magnet produced by electric current.
Passing an electric current through an iron nail may convert it into an _____.
The magnetic material around which the coil is wound is called the _____.
A coil of wire wound around a soft iron bar is called an _____.
The combination of coil and soft iron rod creates a stronger _____ than the coil alone.
The gripper with an electromagnet includes a _____ and a DC power for handling the material.
_____ are used to separate magnetic materials like iron and steel objects from ahead of junk metal scrap.
The cylindrical coil of wire is called a _____.
Electromagnet is made by winding insulated _____ wire around a rod of iron or any other magnetic material.
A length of wire wound closely together is called a _____.
When the electric current is switched off, the coil generally loses its _____.
