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Electrostatic Potential And Capacitance

Question

Two charges of magnitude 8 nC and – 3nC, are placed at points (3 cm, 0, 0) and (30 cm, 0, 0) in a region of space where there is no other external field. Calculate the electrostatic potential energy of this charge system.

Solution

Given,
Charge, q₁ = 8 nC = 8 $\times$ 10^-9 C
Charge, q₂ = -3 nC = C

Electrostatic potential energy is given by,
$U = \frac{q_{1} q_{2}}{4 {πε}_{o} r} = \frac{8 \times 10^{- 9} \times - 3 \times 10^{- 9} \times 9 \times 10^{9}}{(30 - 3) \times 10^{- 2}} = 8 \times 10^{- 7} J$

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Electrostatic Potential And Capacitance

Two charges of magnitude 8 nC and – 3nC, are placed at points (3 cm, 0, 0) and (30 cm, 0, 0) in a region of space where there is no other external field. Calculate the electrostatic potential energy of this charge system.

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