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प्रश्न
How is a tall building protected from damage due to lightning?
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उत्तर
We can protect a tall building from lightning by the use of LIGHTNING CONDUCTOR.
WORKING: When a charged cloud passes over the building induction takes place and opposite charge (negative) is induced on spikes of the conductor. Spikes being pointed (having very small area) cannot hold the charge and charge leaks into air and opposite charge in air and cloud cancel each other. Even if some charge remains on spikes it passes to earth from copper rod and the building is saved.
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संबंधित प्रश्न
A glass rod rubbed with silk repels an ebonite rod rubbed with fur.
Match the following
| Column A | Column B |
| A. Two like charges | 1 negative charge |
| B. Two unlike charges |
2 repel |
| C. Silver is a | 3 insulator |
| D. Silk is an | 4 attract |
| E. Ebonite rod rubbed with fur acquires | 5 conductor |
When a negatively charged body is brought closer to another negatively charged body, then they will show
When a glass rod is rubbed with silk, the glass rod and the silk get charged because
An ebonite rod is rubbed with fur. State the kind of-charge acquired by each.
A glass rod rubbed with silk is suspended near an ebonite r rod rubbed with fur. What will be your observation? Give a reason to your answer.
What causes the charging of two objects when they are rubbed together?
Explain the charging by conduction in terms of movement of electrons.
Describe the method of charging a conductor by induction.
A positively charged glass rod is touched with the disc of an uncharged gold leaf electroscope. What will be your observation?
