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Physics · Electrostatic Potential
हिन्दीTwo point charges \( q_1 = 7\ \mu\text{C} \) and \( q_2 = -2\ \mu\text{C} \) are placed at \( (-9\text{ cm}, 0, 0) \) and \( (9\text{ cm}, 0, 0) \) respectively in an external electric field \( E = A/r^2 \), where \( A = 9 \times 10^5\ \text{N}\cdot\text{m}^2/\text{C} \). What is the total electrostatic energy of the configuration?
Correct answer · Option 3
\( 49.3\text{ J} \)
Explanation
U = q1 V(r1) + q2 V(r2) + q1 q2 / (4 pi eps0 r12) = 70 J - 20 J - 0.7 J = 49.3 J.
