Question

Two points P and Q are maintained at potentials of of 10V and −4V respectively. The work done in moving 100 electrons from P to Q is equal to?

Answer 1

Potential Difference

• Potential difference W is the work done in moving a unit charge.
• Work done in moving a charge Q through potential difference W = Q V

Step 1: Given the data:

Potential of two charges

Potential charge of $P=10V$

Potential charge of $Q=-4V$

Charge$=q=100e$

Step 2: Find out.

We have to determine the work done in moving 100 electrons from P to Q.

Potential difference=$V=-4-10=-14V$

Charge=$q=100e=-1.6\times {10}^{-17}C$

The potential difference,

$$\begin{gathered} W=qV=-1.6\times {10}^{-17}\times (-14) \\ W=2.24\times {10}^{-16}J \end{gathered}$$