CUET · PHYSICS · PYQ PAPER 2025
Two point charges, \( q_1 = 4\mu C \) and \( q_2 = -3\mu C \) (with no external field) are placed at (\(-6 \, cm, 0, 0\)) and (\(6 \, cm, 0, 0\)), respectively. The amount of work required to separate the two charges infinitely away from each other will be
- A \(0.9 J\)
- B \(0.18 J\)
- C \(- 0.9 J\)
- D \(- 0.18 J\)
Answer & Solution
Correct Answer
(A) \(0.9 J\)
Step-by-step Solution
Detailed explanation
\(r = 6 \text{ cm} - (-6 \text{ cm}) = 12 \text{ cm} = 0.12 \text{ m}\) \(U = \frac{k q_1 q_2}{r}\) \(U = \frac{(9 \times 10^9 \text{ Nm}^2/\text{C}^2)(4 \times 10^{-6} \text{ C})(-3 \times 10^{-6} \text{ C})}{0.12 \text{ m}}\) \(U = -0.9 \text{ J}\) \(W = -U\)…
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