1Q: What is magnetism?
Ans: Magnetism is the property of certain materials of attracting small iron pieces towards them.
2Q: What is a magnet?
Ans: A magnet is a piece of iron or other magnetic material which can attract small iron pieces towards it.
3Q: What are the principle properties of a magnet?
Ans: (1) A freely suspended magnet always rests in north-south direction.
(2) Like poles of two magnets repel and unlike poles attract each other.
(3) Each magnet has two poles - North and South.
4Q: What is the molecular theory of magnetism?
Ans: Every molecule of a substance behaves like a tiny magnet because of its spin motion. It has a north and a south pole. When these tiny magnets are set in a definite linear order, the substance then starts to behave as a magnet.
5Q: What are the types of magnets?
Ans: Magnets are of two types - (1) Natural and (2) Artificial.
6Q: What are the types of artificial magnets?
Ans: There are two types of artificial magnets - (1) Permanent magnets and (2) Temporary magnets.
7Q: What materials are used for making permanent magnets?
Ans: Tungsten steel, cobalt steel, ALNICO or ALCONEX alloy are used for making permanent magnets.
8Q: What is meant by magnetic field?
Ans: A magnetic field is the space around a magnet in which the influence of the magnet can be detected.
9Q: What is meant by magnetic line of force?
Ans: A magnetic line of force is an imaginary closed curve which starts from north-pole and terminates at south-pole of the magnet. The curve completes its path through the magnet from south-pole to north-pole.
10Q: Can two lines of force intersect each other?
Ans: No, two lines of force can never intersect each other.
11Q: How does the direction of line of force determined?
Ans: A tangent drawn at any point on a line of force represents the direction of magnetic field acting at that point.
12Q: What is magnetic flux?
Ans: The bunch of magnetic lines of force is called magnetic flux. It is denoted by letter(phi) and its unit is weber.
1 Wb = 10^8 maxwells.
13Q: What is meant by magnetic flux-density?
Ans: The 'magnetic field strength' per unit area is called magnetic flux-density.
14Q: What is an electromagnet?
Ans: A soft iron bar when placed inside a direct current carrying coil acts like a magnet and it is called an electromagnet.
15Q: Is an electromagnet a permanent or temporary magnet?
Ans: An electromagnet is a temporary magnet and its magnetism lasts so long as the current is flowing through its coil.
16Q: What type of magnetic field is formed by a straight current carrying conductor?
Ans: The magnetic field of a straight current carrying conductor is composed of concentric magnetic lines of force.
Ans: Magnetism is the property of certain materials of attracting small iron pieces towards them.
2Q: What is a magnet?
Ans: A magnet is a piece of iron or other magnetic material which can attract small iron pieces towards it.
3Q: What are the principle properties of a magnet?
Ans: (1) A freely suspended magnet always rests in north-south direction.
(2) Like poles of two magnets repel and unlike poles attract each other.
(3) Each magnet has two poles - North and South.
4Q: What is the molecular theory of magnetism?
Ans: Every molecule of a substance behaves like a tiny magnet because of its spin motion. It has a north and a south pole. When these tiny magnets are set in a definite linear order, the substance then starts to behave as a magnet.
5Q: What are the types of magnets?
Ans: Magnets are of two types - (1) Natural and (2) Artificial.
6Q: What are the types of artificial magnets?
Ans: There are two types of artificial magnets - (1) Permanent magnets and (2) Temporary magnets.
7Q: What materials are used for making permanent magnets?
Ans: Tungsten steel, cobalt steel, ALNICO or ALCONEX alloy are used for making permanent magnets.
8Q: What is meant by magnetic field?
Ans: A magnetic field is the space around a magnet in which the influence of the magnet can be detected.
9Q: What is meant by magnetic line of force?
Ans: A magnetic line of force is an imaginary closed curve which starts from north-pole and terminates at south-pole of the magnet. The curve completes its path through the magnet from south-pole to north-pole.
10Q: Can two lines of force intersect each other?
Ans: No, two lines of force can never intersect each other.
11Q: How does the direction of line of force determined?
Ans: A tangent drawn at any point on a line of force represents the direction of magnetic field acting at that point.
12Q: What is magnetic flux?
Ans: The bunch of magnetic lines of force is called magnetic flux. It is denoted by letter(phi) and its unit is weber.
1 Wb = 10^8 maxwells.
13Q: What is meant by magnetic flux-density?
Ans: The 'magnetic field strength' per unit area is called magnetic flux-density.
14Q: What is an electromagnet?
Ans: A soft iron bar when placed inside a direct current carrying coil acts like a magnet and it is called an electromagnet.
15Q: Is an electromagnet a permanent or temporary magnet?
Ans: An electromagnet is a temporary magnet and its magnetism lasts so long as the current is flowing through its coil.
16Q: What type of magnetic field is formed by a straight current carrying conductor?
Ans: The magnetic field of a straight current carrying conductor is composed of concentric magnetic lines of force.
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