Question

A battery is connected with a potentiometer wire. The internal resistance of the battery is negligible. If the length of the potentiometer wire of the same material and radius is doubled then ______.

Options

• Potential gradient becomes two times

• None of these

• Potential gradient becomes half

• Potential gradient does not change

Answer 1

A battery is connected with a potentiometer wire. The internal resistance of the battery is negligible. If the length of the potentiometer wire of the same material and radius is doubled then potential gradient does not change.

Explanation:

V/l represents the potential gradient. The potential gradient remains constant if V and l are both constant. A change in radius will result in a change in current. The potential gradient remains unchanged.