Advertisements
Advertisements
प्रश्न
How is a tall building protected from damage due to lightning?
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.
APPEARS IN
संबंधित प्रश्न
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 glass rod is rubbed with silk, the glass rod and the silk get charged because
A glass rod rubbed with silk is touched with the disc of a negatively charged gold leaf electroscope. The divergence of leaves will
Describe an experiment to demonstrate that there are two r kinds of charges.
What is the net charge on an atom?
Describe the method of charging a conductor by conduction.
A metal rod A is to be charged positively by using another charged rod B. What should be the kind of charge on the rod B if charging is to be done by conduction?
Describe a pith ball electroscope. how can you use it to test whether a body is charged or uncharged?
A negatively charged ebonite rod is touched with the disc of a negatively charged gold leaf electroscope. What will be your observation?
What causes lightning?
