Question

calculate the potential difference two terminal of a battery when 200 j of work is required to transfer 20 c of charge from one terminal to another

Answer 1

As the potential difference between the two terminals of the battery is equal to the work done in moving a unit charge from one terminal to the other.
Potential difference V = Total Work done (W) / Total charge (C)
Potential difference = V = 100J / 20 C
Potential difference = V = 5 J / C