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Question

The electrostatic potential energy of two point charges, 1 μC each, placed 1 meter apart in air is?
  1. 9×103J
  2. 9×109J
  3. 9×103J
  4. 9×103eV

A
9×103J
B
9×109J
C
9×103J
D
9×103eV
Solution
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Step 1: Formula of Potential energy

Electrostatic potential energy is given by U between two charges placed at a separtion r is given by
U=kq1q2r

Step 2: Calculations
Putting values, k=9×109N.m2C2,
q2=q1=1μC=1×106C,
r=1m

U=9×109×1×106×1×1061=9×103J

Hence, correct option is C.

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