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Concepts Of Physics MCQ Edition [Volume 2]PhysicsElectric Field and Potential

Determine the dimensional formula of ₀ .

Options

  1. AM⁻¹ L⁻³ T^4 I^2
  2. BM L^3 T⁻⁴ I^ -2
  3. CM⁻¹ L⁻³ T^3 I
  4. DM⁻¹ L⁻² T^4 I^2

Correct answer

A. M⁻¹ L⁻³ T^4 I^2

Step-by-step solution

Using Coulomb's law: F = 1 4 ₀ q₁ q₂ r^2 Rearranging for ₀ : ₀ = q₁ q₂ 4 F r^2 Substituting the dimensional formulas for charge [q] = I T , force [F] = M L T⁻² , and distance [r] = L : [ ₀] = [I T] [I T] [M L T⁻²] [L^2] [ ₀] = I^2 T^2 M L^3 T⁻² [ ₀] = M⁻¹ L⁻³ T^4 I^2

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