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Maharashtra Board Class 6 Science Chapter 15 Fun with Magnets

Maharashtra Board Class 6 Science Chapter 15 Fun with Magnets

Fill in the blanks with the appropriate word.

(a) If a bar magnet is hung by a thread tied at its centre, its north pole becomes steady in the direction of the ……………. Pole of the earth. (South, north, east, west)

(b) If a bar magnet is cut into equal pieces by cutting it at right angles to its axis at two places, ……3….. bar magnets are formed, and a total of ……..6…….. poles are formed. (6,3,2)

(c) There is repulsion between the ………. poles of a magnet, and attraction between its ………… poles. (opposite, like.)

 

(d) When magnetic material is taken close to a magnet, the material acquires …………… . (permanent magnetism, induced magnetism)

(e) If a magnet attracts a piece of metal, that piece must be made of …………. . (any other metal but iron, magnetic material or iron, non-magnetic material)

(f) A magnet remains steady in a ………….. direction. (east-west, north-south)

 

Write the answers in your words.

 

How is an electromagnet made ?

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Here are the basic steps to make an electromagnet:

  1. Get a long piece of wire, preferably insulated copper wire. The longer the wire, the stronger the electromagnet will be.
  2. Wrap the wire around a piece of metal that can be magnetized, such as an iron nail or bolt. Make sure that the wire is tightly wrapped around the metal and that there are no loose ends.
  3. Connect the two ends of the wire to a battery or power supply. The power supply will create a flow of electricity through the wire, which will create a magnetic field around the metal.

 

Write the properties of a magnet.

The properties of magnets are as follows:

  • North and South poles are the two poles of a magnet.
  • Magnets always rest in the north-south direction when suspended freely.
  • Magnets have attractive properties, in the sense that magnetic materials are always attracted to them.
  • The like poles of magnets repel each other, whereas the unlike poles attract each other.
  • A magnet consists of two poles that cannot be separated. By dividing a magnet into two parts, two independent magnets are formed.
  • Magnetic force is concentrated at its two poles.

 

What are the practical uses of a magnet ?

There are many practical uses for magnets. Magnets are commonly used for:

  • To store and read data, magnets are used in computer hard drives, tape drives, and other devices.
  • Magnets are used in electric motors and generators to convert electrical energy into mechanical energy.
  • Magnets convert electrical signals into sound waves in speakers and headphones.
  • Security systems and locks use magnets to secure doors and windows.
  • Medical imaging devices use magnets to create detailed images of the body’s internal structures via magnetic resonance imaging (MRI).
  • Magnets are used in maglev trains to propel the train forward without friction.
  • Industrial processes use magnets to separate magnetic materials from non-magnetic materials.
  • Compasses use magnets to show the direction of the Earth’s magnetic field, which can be used to determine travel direction.

 

What is Magnetism?

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