Two point charges 4 micro C and 10 micro C are placed at 20cm distance.The electrostatic potential energy of the system is
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q₁ = 4×10⁻⁶ C
q₂ = 10×10⁻⁶ C
r = 20cm = 0.2m
Electrostatic potential = U
U = -kq₁q₂/r
U = -9×10⁹×4×10⁻⁶×10×10⁻⁶ / 0.2
U = -360×10⁹⁻¹² / 0.2
U = -3600×10⁻³ / 2
U = -1800×10⁻³
U = -1.8J
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