Question

Two point charges of \(1\,\text{nC}\) and \(2\,\text{nC}\) are placed at two corners of an equilateral triangle of side \(3\) cm. The work done in bringing a charge of \(3\,\text{nC}\) from infinity to the third corner of the triangle is ________ \(\mu\text{J}\). \[ \left(\frac{1}{4\pi\varepsilon_0}=9\times10^9\,\text{N m}^2\text{C}^{-2}\right) \]

• A. \(5.4\)
• B. \(27\)
• C. \(3.3\)
• D. \(2.7\)

Hint:

To find work done in electrostatics, always compute the electric potential first—this avoids dealing directly with forces.

Answer 1

The Correct Option is D