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COMEDK2016PhysicsElectrostatics

Potential energy of 2 charge 10 nC each separated by a distance of 0.09 ~m in air is

Options

  1. A10 J
  2. B1 ~mJ
  3. C10 ~mJ
  4. D10 ~J

Correct answer

A. 10 J

Step-by-step solution

Given q₁=q₂=10 nC =10 10⁻⁹ C r=0.09 ~m Potential energy of two point charges is given by aligned U &= 1 4 ₀ q₁ q₂ r &=9 10⁹ 10 10⁻⁹ 10 10⁻⁹ 0.09 =10⁻⁵ ~J &=10 J aligned

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