AP EAMCET · PHYSICS · Electrostatics
Three point charges \(1 \mathrm{C}, 2 \mathrm{C}\) and \(3 \mathrm{C}\) are placed at the comers of an equilateral triangle of side one metre. The work done to move these charges to the corners of another equilateral triangle of side \(0.5 \mathrm{~m}\) is
- A \(199 \times 10^9 \mathrm{~J}\)
- B \(19 \times 10^9 \mathrm{~J}\)
- C \(99 \times 10^9 \mathrm{~J}\)
- D \(29 \times 10^9 \mathrm{~J}\)
Answer & Solution
Correct Answer
(C) \(99 \times 10^9 \mathrm{~J}\)
Step-by-step Solution
Detailed explanation
Initial potential energy of system of charges \(\mathrm{U}_{\mathrm{i}}=\mathrm{k}\left[\frac{\mathrm{q}_1 \mathrm{q}_2}{\mathrm{r}}+\frac{\mathrm{q}_2 \mathrm{q}_3}{\mathrm{r}}+\frac{\mathrm{q}_3 \mathrm{q}_1}{\mathrm{r}}\right]\) Substitute the necessary values,…
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