Question

A cell drives a current through a circuit. The e.m.f. of the cell is equal to the work done in moving unit charge:

• A. from the positive to negative plate of the cell
• B. from the positive plate back to the positive plate
• C. from the negative plate back to the negative plate
• D. from any point in the circuit back to the same point

Answer 1

Answer: (B), (C), (D)

The correct options are
B from the positive plate back to the positive plate
C from the negative plate back to the negative plate
D from any point in the circuit back to the same point

Options B, C and D are correct.

The E.M.F of a cell is the work done in moving a unit positive charge in a loop or from the terminal to the same terminal. The force it experiences is a conservative force.
Hence, the statements in options B, C and D are correct.