Goyal Brothers Prakashan solutions for A New Approach to ICSE Physics Part 1 [English] Class 9 chapter 11 - Electricity and Magnetism – 2 [Latest edition]

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A bar magnet is rubbed on a bar of steel along its length 20 times. The bar of steel gets magnetised due to the process of:

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The magnetic strength of a bar magnet is:

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The surest test of magnetism is

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Nickel is a:

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The substance which form a strong temporary magnet is:

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The place around a magnet where its influence can be detected is called:

What do you meant by the term pole of a magnet? Magnetically speaking, what is the difference between a piece of brass, a piece of soft iron, and a piece of lode- stone?

What are magnetic and non-magnetic substances? Give two examples of each.

Fill the blank spaces in the table given below:

Define the magnetic field.

Define the magnetic meridian.

Define the geographical meridian.

Define the declination.

Define Magnetic equator.

Why do lines of magnetic force never cross? Why do they never pass through a neutral point?

Define the Isogonic line.

Define the agonic line.

Define the isoclinic line.

How do you account for the following fact?

Iron becomes magnetized when placed in a coil carrying direct current.

How do you account for the following fact?

Bar magnets lose their magnetism when heated strongly.

How do you account for the following fact?

Steel makes better permanent magnet than soft iron.

How do you account for the following fact?

Soft iron keepers help to prevent the magnets from losing their magnetic properties.

State briefly the molecular theory of magnetism.

State briefly the modern views on magnetism.

Describe various methods of magnetising a piece of iron.

What is magnetic induction?

Explain a suitable experiment of magnetic induction?

Repulsion is a surer test of magnetic condition of a body than attraction. Explain.

There are two knitting needles. One of them is magnetized. How will you find out which one is magnetized, if no other magnet is available?

Describe two methods of determining the arrangement of the lines of force in the field close to a bar magnet. Give a brief explanation of each method.

Draw diagram showing the arrangement of the lines of force for a single magnet.

Draw diagram showing the arrangement of the lines of force for two magnets in line, with unlike poles facing one another.

Draw diagram showing the arrangement of the lines of force for a piece of soft iron laid in line with the magnetic field.

Give short account of the earth’s magnetic field.

Give the various methods for demagnetizing a magnet.

Describe two simple experiments to support the statement that magnetism is a property of the molecules of a magnet.

Explain, why steel is used in preference to soft iron for making permanent magnets while soft iron is used in preference to steel for making electromagnets.

Describe, how you will proceed to determine the position of the pole of a bar magnet.

Draw lines of force surrounding a bar magnet when it is placed in the magnetic meridian with its north pole pointing geographic, north.

Draw lines of force surrounding a bar magnet when it is placed in the magnetic meridian with its north pole pointing geographic south.

Bar magnets are often stored in pairs as shown in the figure. E and F being pieces of metal.

Name the metal used for E and F.

Bar magnets are often stored in pairs as shown in the figure. E and F being pieces of metal.

Why are E and F placed in contact with the poles of the magnets as shown in the diagram?

Bar magnets are often stored in pairs as shown in the figure. E and F being pieces of metal.

Mark on the diagram the poles of the second magnet,

Bar magnets are often stored in pairs as shown in the figure. E and F being pieces of metal.

What is the material of darkened part?

The figure shows a freely suspended magnet in the rest position. Copy the diagram and on its show:

1. Angle of declination
2. Angle in dip

Since every iron atom is a tiny magnet, why are not all iron bar magnets?

 If a magnet is carefully broken into two pieces as shown in figure (i), how does the magnetic strength of each piece compare with that of the original magnet? If another magnet is carefully broken in half along its long axis shown in figure (ii), how would the strength of each piece compare with that of the original magnet?

Draw the magnetic flux pattern near a bar magnet placed with its axis in the magnetic meridian and the south pole pointing towards geographic north.

Draw a clearly labelled diagram, to show how a steel bar is magnetised by a divided touch method. A written description is not required.

Define the terms magnetic declination and dip with reference to a freely suspended magnet.

Define the geographical meridian.

Define the magnetic meridian.

At what places on the earth will the angle of dip be maximum and minimum?

What are magnetic keepers? What are they used for?

State briefly the molecular theory of magnetism.

What do you understand by the term magnetic declination?

Explain the mechanism by which unmagnetized iron nails get attracted to a magnet when brought near it.

State any two properties of a magnet.