Device which helps in maintaining a potential difference across a conductor is(A) A cell(B) A battery (C) Both(D) None

The correct answer is (C) Both.

Both a cell and a battery can help maintain a potential difference across a conductor.

A cell is a single electrochemical device that converts chemical energy into electrical energy. It consists of two electrodes (anode and cathode) immersed in an electrolyte solution. The chemical reactions occurring within the cell create a potential difference between the electrodes, resulting in the flow of electrons through an external conductor.

A battery, on the other hand, is a collection of two or more cells connected in series or parallel. The cells within a battery work together to provide a larger potential difference and longer-lasting electrical energy. The combined effect of multiple cells in a battery allows for a more sustained and stable potential difference across a conductor.

So, both a single cell and a battery can serve as devices to maintain a potential difference across a conductor.