Magnetization Methods and Principles

The video tutorial explains how to make magnets using different methods: single touch, double touch, induction, and electric. Each method is described in detail, showing how a steel bar can be magnetized. The single touch method uses one magnet, while the double touch method uses two. The induction method magnetizes without contact, and the electric method uses a copper wire and electric current to create an electromagnet. The video also discusses factors affecting magnetization and the difference between permanent and temporary magnets.

What is the process called when a material is made magnetic by placing it in a magnetic field?

• Ionization

• Electrification

• Magnetization

• Polarization

In the single touch method, what happens if the south pole of a magnet is used to rub the steel bar?

• End B becomes the south pole

• End A becomes the south pole

• End B becomes the north pole

• End A becomes the north pole

What is the result of rubbing the steel bar with the north pole of a magnet in the single touch method?

• End A becomes the south pole

• End B becomes the south pole

• End B becomes the north pole

• End A becomes the north pole

How many magnets are required in the double touch method?

• Three

• Four

• Two

• One

In the induction method, what is the relationship between magnetic induction and the distance between the magnet and the substance?

• Directly proportional

• Inversely proportional

• Exponentially proportional

• No relation

Which material becomes a permanent magnet when magnetized using the induction method?

• Soft iron

• Copper

• Steel

• Aluminum

Which method of magnetization does not require direct contact with the magnet?

• Induction method

• Double touch method

• Single touch method

• Electric method

What is the main factor that determines whether a material becomes a permanent or temporary magnet in the induction method?

• The size of the magnet

• The temperature of the environment

• The nature of the magnetic substance

• The color of the magnet

What is the principle behind electromagnets?

• A wire attracts magnetic fields

• A wire repels magnetic fields

• A magnet induces current in a wire

• A wire carrying electric current behaves like a magnet

In the electric method, what happens when the switch is opened?

• The steel bar becomes a permanent magnet

• The steel bar becomes a stronger magnet

• The steel bar loses its magnetic properties

• The steel bar changes polarity