Question

If the amount of work done to transfer 30 coulombs of charge is 300 J, then the potential difference between two ends of battery is________.

• A. 900 V
• B. 100 V
• C. 0 V
• D. 10 V

Answer 1

The correct option is D

10 V

Given:
Work done W = 300 joule
Charge Q = 30 coulomb
Let V be the potential difference across battery.
Work done is given by $W=V\times Q$
Or, potential difference $V=\frac{W}{Q}=\frac{300}{30}=10V$