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NEET Physics QUESTION #7232
Question 1

The dimensional formula of polarisation (electric dipole moment per unit volume) is:

  • $[L^{-2}T^1A^1]$✔️
  • $[L^2T^1A^{-1}]$
  • $[L^{-2}T^1A^1]$
  • $[L^{-3}T^{-1}A^1]$
Correct Answer Explanation

Electric polarisation $P = \dfrac{\text{dipole moment}}{\text{volume}}$

Electric dipole moment $p = q \cdot d$, so $[p] = C \cdot L = A \cdot T \cdot L$

$[P] = \dfrac{[p]}{[V]} = \dfrac{ATL}{L^3} = ATL^{-2} = L^{-2}T^1A^1$