Question

A charge of 0.20uC is 30cm from a point charge of 3.0uC in vacuum. what work is required to bring the 0.2uC charge 18cm closer to the 3.0uC charge?​

Answer 1

Answer:

The correct answer is "$4.49\times 10^{10} \ joules$".

Explanation:

According to the question,

The work will be:

⇒ $Work=-\frac{kQq}{R}$

              $=-\frac{1}{4 \pi \varepsilon \times (18-30)\times 3\times 0.2}$

              $=-\frac{1}{4 \pi \varepsilon \times (-12)\times 3\times 0.2}$

              $=\frac{0.3978}{\varepsilon }$

              $=4.49\times 10^{10} \ joules$

Thus the above is the correct answer.