Magnetic Force

Q.

Why do like poles of a magnet repel each other? What is the name of this particular force? What makes metals attract themselves to the magnet?

Q.

Which of the following is/are magnetic material(s)?

1. Cobalt

2. Iron

3. Plastic

4. Nickel

Q.

What is the general law of attraction and repulsion between the magnetic poles?

Q.

Give one practical application of magnetic force.

Q. Magnetic force acting on the charged particle projected perpendicular to magnetic field is proportional to r to the power n where r is radius of circular path .Find n

Q.

Which force can be used to gather iron pins scattered on the floor?

Q.

Why is wood not attracted to a magnet?

Q.

The property of magnets to attract iron is called magnetism.

1. True
2. False

Q. Magnetic force is a contact force.

1. True
2. False

Q.

A small device pulls iron nails from a distance. Which type of force is involved in this process?

Q.

The magnetic force always causes attraction.

1. True
2. False

Q.

The north pole of a magnet attracts the north pole of another magnet.

1. True
2. False

Q.

Two magnets are attracted towards each other. Its an example of contact force.

1. True

2. False

Q.

Which property of a magnet is used to determine the polarity of the magnet?

Q. The South pole of a bar magnet is brought near the North pole of a freely suspended magnetic needle. Then, the two will

1. repel each other
2. attract each other
3. remain stationary
4. start rotating

Q. The force exerted by a magnet on an iron bar is an example of:

1. Gravitational force
2. Non-contact force
3. Electrostatic force
4. Contact force

Q.

……………force can pull small objects of iron.

Q.

A strong magnet can attract all metallic objects.

1. True
2. False

Q. A magnet can only attract bodies which themselves are magnets.

1. True
2. False

Q. Magnets are attached to two toy cars as shown below. The cars will attract each other.

1. True
2. False

Q. A magnet is kept on the ground. Another magnet is hovering above this magnet. Identify the forces and their respective directions on the hovering magnet.

1. Gravity - downwards
   Magnetic - upwards
2. Gravity - upwards
   Magnetic - downwards
3. Gravity - upwards
   Electrostatic - downwards
4. Gravity - downwards
   Electrostatic - upwards

Q.

Give one word for the following.

• Property of a magnet to attract the magnetic substance.

Q.

A magnet attracts only a magnet

1. True
2. False

Q.

Give one practical application of magnetic force

Q.

Write down the name of two forces which are non-contact forces?

Q.

Magnetic force is:

1. Only attractive in nature

2. Repulsive in nature

3. Both attractive and repulsive in nature

4. None of the above

Q. Which of the following properties are shown by a magnet?

1. Like poles attract each other.
2. Unlike poles repel each other.
3. Like poles repel each other.
4. Unlike poles attract each other.

Q.

A boy while playing with two magnets, got familiar with their attractive and repulsive properties. He observed that the magnets are either attracting or repelling each other from a distance. From this, we can conclude that:

1. Contact is necessary for a force to act.
2. Non-contact forces do not exist.
3. Force may be in contact or not in contact depending upon its nature.
4. No contact is necessary for a force to act.

Q.

Magnetic and electrostatic forces are contact forces.

1. True

2. False

Q. Which of the following properties are shown by a magnet?

1. Like poles attract each other.
2. Unlike poles repel each other.
3. Like poles repel each other.
4. Unlike poles attract each other.