Properties of Magnetic Field Lines

Q.

What is the Angle of Dip?

Q.

What is a non contact force? Give some examples of it and explain why they are non-contact forces? [3 MARKS]

Q.

why does magnets repel similar poles (e.g.north and north) when they are brought close enough.

Q.

The magnetic field lines always form an open loop.

1. True

2. False

Q. Which of the following is incorrect regarding the magnetic lines of force?

1. Direction of magnetic lines of force for a bar magnet is from N pole to S pole outside the magnet
2. Magnetic lines of force bend sideways, when the unlike poles of magnets come near each other
3. Magnetic lines of force do not intersect
4. Direction of magnetic lines of force for a bar magnet is from S pole to N pole inside the magnet

Q. Which of the following is/are example(s) of non-contact force?

1. Magnetic force
2. Frictional force
3. Gravitational force
4. Electrostatic force

Q. What is the difference between contact and non-contact forces? Explain with examples.

Q.

Repulsion is the sure test for magnetism.

1. True

2. False

Q. The diagram shows magnetic field lines in a magnetic field. A, B, and C are the three points in the field. Where will the field strength be maximum?

1. C
2. B
3. A
4. Same at all the points.

Q. Consider the following statements:
Statement 1: When iron fillings are sprinkled on a magnet, they align themselves as shown

Statement 2: Magnetic field of the magnet, apply force on each filing which aligns them as shown.

1. Both statements are correct and statement 2 is the correct reason for statement 1.
2. Both statements are correct but statement 2 is not the correct reason for statement 1.
3. Statement 1 is correct but statement 2 is incorrect.
4. Both the statements are incorrect.

Q. As we go away from the magnet, the strength of the magnetic field________.

1. Increases
2. Decreases
3. Remains constant
4. First increases and then decreases

Q.

What constitutes the field of a magnet?

Q. Statement 1: In temporary magnets, the North Pole and the South Pole are fixed.
Statement 2: In permanent magnets, the position of the North and the South Pole can be interchanged.

1. Statement 1 is correct and Statement 2 is wrong.
2. Statement 1 is wrong and Statement 2 is correct.
3. Both the Statements are correct.
4. Both the Statements are wrong.

Q.

In which direction does a freely suspended magnet align?

1. Soth - east

2. West- north

3. South - west

4. North - south

Q.

Which one of the following forces is a contact force?

1. force of gravity

2. force of friction

3. magnetic force

4. electrostatic force

Q.

List two causes of demagnetisation of magnet.

Q.

Write three characteristics of force acting from a distance.

Q.

If a compass is taken inside a bar magnet exactly at the center, then in which direction will it point?

1. Towards 1

2. Towards 2

3. Will keep on fluctuating between 1 and 2

4. Will keep on fluctuating between 3 and 4

Q.

Friction force is an example of ______ where as gravitational force is of ______.

Q.

Which of the following force is/are contact force/(s)?

1. Magnetic forces

2. Gravitational force

3. Electrostatic force

4. None of these

Q.

Which of the following does not affect the magnetic properties of a material?

1. Painting

2. Radiation

3. Heat

4. Other magnets in close proximity to the magnet

Q. _______force is a non-contact force whereas _______ force is a contact force.

1. Magnetic, frictional
2. Muscular, gravitational
3. Frictional, muscular
4. Gravitational, magnetic

Q.

Two magnetic field lines can not intersect each other because

1. Field lines lie far from each other

2. One point can not show multiple poles

3. Field lines does not exist in reality

4. Field line intensity is week

Q.

The magnetic field strength at 1, 2 and 3 in the given figure are such that:

1. Strength at 1 > 3 > 2

2. Strength at 1 > 2 > 3

3. Strength at 3 > 2 > 1

4. Strength at 1 = 2 = 3

Q. An example of contact force is ________.

1. electrostatic force
2. gravitational force
3. magnetic force
4. muscular force

Q.

Which of the following statement(s) is/are true about magnets?

1. Artificial magnets were discovered in Greece.

2. A compass can be used to find East-West direction at any place.

3. Similar poles of a magnet repel each other.

4. A cylindrical magnet has only one pole.

Q. What can you say about the strength of an electromagnet, if the number of turns of the coil is decreased?

1. We get a weaker electromagnet.
2. We get a stronger electromagnet.
3. The strength depends on the insulated wire.
4. It can’t be determined.

Q.

(a) What is a magnet?

(b) What are two kinds of magnets?

(c) Define each kind of magnet stated by you in (b)

Q.

A freely suspended magnet aligns itself in ____ direction.

Q.

Which is not an example of a contact force?

1. A freely falling stone

2. A horse pulling a cart

3. Cutting vegetables

4. Pulling a spring