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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
When an ebonite rod is rubbed with fur, the electrons move from ebonite to fur.
The cap of gold leaf electroscope is made of copper.
To find whether a body is charged or not, an uncharged electroscope is used.
The factor responsible for charging a conductor is
Name two substances which can be charged by friction.
What are the two kinds of charges?
In each of the following cases, State which body loses electrons:
(a) A glass rod when rubbed with silk.
(b) An ebonite rod when rubbed with fur.
Can you charge an insulator by the method of conduction?
A negatively charged ebonite rod is touched with the disc of a negatively charged gold leaf electroscope. What will be your observation?
State three safety measures that you will observe in thunder storm.
