Which of the following statements about an electromagnet is NOT true-Insulated wire is wound around it-It works only in the presence of electricity-It is used in fans and radio-It is a permanent magnet-

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Byju's Answer

Standard VIII

Physics

Temporary Magnets

Which of the ...

Question

Which of the following statements about an electromagnet is NOT true?

Insulated wire is wound around it.

No worries! We‘ve got your back. Try BYJU‘S free classes today!

It works only in the presence of electricity.

No worries! We‘ve got your back. Try BYJU‘S free classes today!

It is used in fans and radio.

No worries! We‘ve got your back. Try BYJU‘S free classes today!

It is a permanent magnet.

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Open in App

Solution

The correct option is D
It is a permanent magnet.

An electromagnet is made by winding an insulated wire around a magnet. It works as a standard magnet only when an electric current is passed through it ( by generating magnetic fields). When the electric current is removed, the magnetic field exhausts. Thus an electromagnet is a temporary magnet and not a permanent magnet.

Suggest Corrections

Similar questions

Q. The main advantage of a permanent magnet over an electromagnet is that a permanent magnet does not require a continuous supply of electrical energy to maintain its magnetic field.
State whether the above statement is true or false?

Q. Which of the following statements are true for permanent magnet?
a. It is made of steel
b. It has a strong magnetic field which can be altered
c. Polarity cannot be reversed
d. Used in electric meters, magnetic compasses etc

What is an electromagnet and how is it different from a permanent magnet? Also state Why is iron used as the core of an electromagnet?

Q. The switch of an electric bell is pressed. Now, arrange the following statements using the working of an electric bell.

(i) Electromagnet loses its magnetism and the striker goes back its original position.
(ii) The current flows through the circuit and electromagnet attracts the striker towards it.
(iii) The striker hits the gong and the circuit is broken.

Question 6
Commercial electric motors do not use

(a) an electromagnet to rotate the armature
(b) effectively large number of turns of conducting wire in the current carrying coil
(c) a permanent magnet to rotate the armature
(d) a soft iron core on which the coil is wound

Join BYJU'S Learning Program