Two positive point charges of $12 \mu C$ and $8 \mu C$ are …

Physics Electrostatics Potential & Capacitance Electric Field and Potential,Defference,Energy and Dipole Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: September 12, 2026

Two positive point charges of $12 \mu C$ and $8 \mu C$ are 10cm apart. The work done in bringing them 4 cm closer is

5.8 J

5.8 eV

13 J

13 eV

Text Solution

Verified by Experts

The correct answer is:

$W = U_f - U_i = 9 \times 10^9 \times Q_1 Q_2 \left[\frac{1}{r_2} - \frac{1}{r_1}\right]$

⇒ ⇒ $W = 9 \times 10^{9} \times 12 \times 10^{-6} \times 8 \times 10^{-6} \left[ \frac{1}{4 \times 10^{-2}} - \frac{1}{10 \times 10^{-2}} \right]$

= 12.96 J ≈ ≈ 13 J

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