Bihar Police Constable Model Paper 7

Explanation:

There are two types of charges found in nature -

1. Positive charge
2. Negative charge

Properties of charges:

1. Like charges (same charges) repel each other.
2. Unlike charges (different charges) attract each other.

When two objects are rubbed against each other, they develop charges.

Earthing: The process of transfer of charge from a charged object to the Earth is known as Earthing.

Lightning is caused because of the build-up of electrostatic charges in the clouds.

Lightning Conductor: It is a device used to protect buildings from the effect of lightning.

• A metallic rod, taller than the building, is installed in the walls of the building during its construction.
• One end of the rod is kept out in the air and the other is buried deep in the ground.
• The rod provides an easy route for the transfer of electric charge to the ground.
• Copper is used because it is a good conductor of electricity.
• The lightning conductor is sharp-pointed because this will ensure high electric field and hence the quick flow of electric charges to the ground.

Hence, The lightning conductor should be made of a good conductor like copper with sharp - pointed edges