NEET2020Physics-Electrostatics
NEET 2020 Physics Effect of Dielectric on Capacitance MCQ Question
Type: MCQ-numerical-Easy-Class 12
The capacitance of a parallel plate capacitor with air as medium is 6 μF. With the introduction of a dielectric medium, the capacitance becomes 30 μF. The permittivity of the medium is:
A
0.44 × 10⁻¹⁰ C² N⁻¹ m⁻²
B
5.00 C² N⁻¹ m⁻²
C
0.44 × 10⁻¹³ C² N⁻¹ m⁻²
D
1.77 × 10⁻¹² C² N⁻¹ m⁻²
Correct Answer
Option A
Detailed Explanation
The dielectric constant k = C/C₀ = 30/6 = 5. The permittivity of the medium ε = kε₀ = 5 × 8.85 × 10⁻¹² = 44.25 × 10⁻¹² = 0.44 × 10⁻¹⁰ C² N⁻¹ m⁻². The original explanation incorrectly stated ε = 1.77 × 10⁻¹² (which is ε₀ itself). The correct answer is A.
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