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प्रश्न
Give a reason for the following.
When a comb is rubbed with dry hair it attracts small bits of paper.
उत्तर
Reason:
Comb rubbed with hair gains electrons from the hair and becomes negatively charged. These electrons are accumulated on the surface of the comb. When a piece of paper is torn into bits, positive and negative charges are present at the edges of the bits. Negative charges in the comb attract positive charges in the bits. So, the paper bits are moving towards the comb.
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संबंधित प्रश्न
Define the term current.
Match the following.
| Two similar charges | acquires a positive charge |
| Two dissimilar charges | prevents a circuit from overheating |
| When glass rod is rubbed with silk | repel each other |
| When ebonite rod is rubbed with fur | attract each other |
| Fuse | acquires a negative charge |
How charges are produced by friction?
The material which allows electric current to pass through it is called ______.
Flow of per unit time is called current ______.
Before the discovery of electrons, it was considered that electric current is due to the flow of ______ charges.
What are electrodes?
