Advertisements
Advertisements
Question
Describe two simple experiments to support the statement that magnetism is a property of the molecules of a magnet.
Advertisements
Solution
Magnetism is a property of molecules of a magnet.
Experiment-1: Take a bar magnet and break it into as small parts as possible. We shall find that each small part retain the original polarity i.e. even the smallest part of the magnet has its own north and south pole and can attract the magnetic substances.
It shows that, if it were possible to break a magnet into its molecules then each molecule would retain the property of a magnet.
Experiment-2: Take a soft iron bar. Place it in a magnetic field. We shall find that there is a small increase in its length on getting magnetized.
A soft iron bar becomes magnetized and gets lengthened only if each molecule of soft iron bar behaves as a magnet. Due to the setting of molecular magnets along straight chains, there is a slight increase in the length of soft iron bar. So we can say that magnetism is a property of molecules of a magnet.
APPEARS IN
RELATED QUESTIONS
“Poles exist in pair”. Comment on this statement ?
Match the following
| Column A | Column B |
| A) Steel | 1) to store magnets |
| B) Soft iron | 2) temporary magnet |
| C) Use in electric bell | 3) permanent magnet |
| D) Magnetic keepers | 4) electromagnet |
Answer the following in short.
If a bar magnet is placed over iron filings, where will the attraction of the iron fillings be
- maximum?
- minimum?
Answer the following in detail.
How is the single-touch method of magnetism different from the double-touch method?
There is repulsion between the _____ poles of a magnet and attraction between its _____ poles.
Write the answer in your word.
What are the practical uses of a magnet?
The alloys called ______ and ______ are used for making industrial magnets.
State the laws of magnetism.
How can you identify non-magnetic materials? Give an example of a nonmagnetic material.
Define artificial magnet.
