Electrical Method of Magnetic Induction

Q.

You are given an iron strip. How will you convert it into a magnet? [5 MARKS]

Q.

Explain the induction method of magnetizing an iron piece with an example.

Q.

Making a magnetic substance a magnet by bringing it closer to another magnet without touching it, is:

1. Magnetic induction method

2. single touch method

3. double touch method

4. electric method

Q.

examples of temporary and permanent magnets?

Q. Match the suitable materials with their categories.

1. Bar magnet
2. Lodestone
3. Cobalt

Q. Match the suitable materials with their categories.

1. Bar magnet
2. Lodestone
3. Cobalt

Q. Match the suitable materials with their categories.

1. Lodestone
2. Cobalt
3. Bar magnet

Q. Two bars of soft iron exactly alike are given. One of them is a magnet. Without using anything more, how would you find which is a magnet -

1. By bringing two bars near and noting which one is attractive. The attracting one is a magnet
2. By bringing two bars near and noting which one is repelling. One which repels is an ordinary iron.
3. By rubbing one bar with the other and noting which becomes a magnet. The bar which is magnetized is an ordinary iron.
4. One bar is placed flat horizontally on the table and the other bar is held vertical with its one end on the middle of the first bar. If there is the attraction between the two, the vertical bar is magnet otherwise ordinary iron.

Q. Lodestones are naturally occuring magnets.

1. False
2. True

Q. We can change the strength of electromagnets by changing the amount of electricity which is passing through them. Now, answer the following question: The electromagnets are ___________

1. Not magnets
2. Permanent magnets
3. Temporary magnets
4. Always stronger than magnets which occur naturally in nature

Q. A copper wire conducting electricity gets heated up because of heating effect of electric current.

1. True
2. False

Q. In magnetic method, a permanent magnet is brought in contact to a to magnetize it.

1. conduction
2. induction
3. non-metal
4. metal

Q. Lava from volcanoes is one of the probable reason for existence of permanent magnets.

1. False
2. True

Q. If we attach one end of an iron nail to the south pole of a bar magnet, the other free end of the nail would behave as.

1. north pole
2. south pole
3. non-magnet