COMEDK2013PhysicsUnits and Dimensions
SI unit of permittivity is
Options
- AC ² ~m ² ~N ²
- BC ² ~m ⁻² ~N ⁻¹
- CC ² ~m ² ~N ⁻¹
- DC ⁻¹ ~m ² ~N ⁻²
Correct answer
B. C ² ~m ⁻² ~N ⁻¹
Step-by-step solution
From Coulomb's law, force between two charges, F= 1 4 ₀ q₁ q₂ r² aligned & ₀= q₁ q₂ 4 r² F & Unit of ₀= C C m ² ~N = C ² ~m ² ~N = C ² ~m ⁻² ~N ⁻¹ aligned