Question

Mention the condition under which charges can move in a conductor. Name the device which is used to maintain this condition in a electric circuit.

Answer 1

Charges can move, if there is a difference of electric pressure or potential difference along the conducor. Electric cell or a battery ( consisting of o e or more cells) is a device used to maintain the condition in an electric circuit.

Answer 2

The condition for the charges to move in a conductor is the presence of a potential difference across the conductor.

• Free charges (electrons) inside a conductor move randomly in every direction such that the net motion of charges remains zero.
• To move the charges in the required direction to set a current, we need to apply a net electric field across the conductor.
• This electric field is created by maintaining a potential difference across the conductor.
• A device that is used to maintain this condition in a circuit is an electric cell/battery.