What is magnetic induction ? Describe in detail how a steel needle can be magnetised by induction.

Open in App

Solution

Magnetic induction:- Magnetic induction is the production of an electromotive force across an electrical conductor in a changing magnetic field.

Magnetic induction is one of the ways of making magnetic material like steel and iron into magnets. In other words, magnetic induction is a process of inducing magnetism in an ordinary piece of magnetic material.

Following steps are-

1). Simply place the steel needle close to a strong magnet without touching.

2). The steel needle bar becomes an induced magnet with the end nearer the magnet having opposite polarity to that of the magnet.

3). Hence, the iron needle is attracted and attached to the permanent magnet. The magnetic induction process reveal how magnetic materials can be attracted to magnets.

4) Induced magnetism is a temporary process. If the permanent magnet is removed, the magnetic material will usually lose its induced magnetism.

Suggest Corrections

Similar questions

Q. A specimen of iron is uniformly magnetised by a field of

500 A m^{- 1}

. If the magnetic induction in the specimen is

0.2 W b m^{- 2}

, susceptibility is :

Transformers works on mutual induction due to which magnetic field are generated .lf we will bring a magnetic needle near transformer will there be any deflection in the needle?

Q. A magnetic needle is kept in a uniform magnetic field of induction

0.5 \times 10^{- 4} T

. It makes

30

oscillations per minute. If it is kept in a field of induction

2 \times 10^{- 4} T

, then its frequency is :

Q. A magnetised steel wire

31.4 c m

long has a pole strength of

0.2 A m

. It is then bent in the form of a semicircle. Calculate the magnetic moment of this needle.

By using a compass needle describe how can you demonstrate that there is a magnetic field around a current carrying conductor.

Join BYJU'S Learning Program