Electric Charge...

Each of the two point charges are doubled and their distance is halved. Force of interaction becomes n times, where n is

What happens when the end of the paper clip of electroscope is touched by hands?

When a charged body is brought near an electroscope:

What will be the nature of charge on the metal paper clip of electroscope when a negatively charged body is brought in contact with it?

Electric switches and appliances should be tested only with 

An electroscope is used:

The electric field inside a hollow conducting sphere

The nature of charge on the object can be detected by:

The device, which can be used to detect whether an object is charged, is:

Two point charges $$+3\mu C$$ and $$+8\mu C$$ repel each other with a force of $$40 N$$. If a charge of $$-5\mu C$$ is added to each of them, the force between them will become: