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Question 31596
JEE Physics · Hard

Capacitance: Dielectric Constant of Water MCQ

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Dielectric Constant of WaterHardQuestion 31596

Question

Water has a high dielectric constant (~80) mainly because:
  1. A
    High density
  2. B
    Large permanent dipole moment and hydrogen bonding
    Correct
  3. C
    Optical transparency
  4. D
    Low viscosity

Correct answer

Large permanent dipole moment and hydrogen bonding

Explanation

Water molecules have a large permanent dipole (1.85 D) that aligns strongly with external fields, giving ε_r ≈ 80 at room temperature.

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