A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor: - Physics MCQ AIEEE 2003 2026 | ExamTest.live | ExamTest.live

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A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor:

A $decreases$
B $remains unchanged$
C $becomes infinite$
D $increases$

Solution & Step-by-step Explanation

Capacitance with a slab of thickness t is C^{'} = \frac{ϵ _{0} A}{d - t ( 1 - 1/ K )} .For a metal, K = \infty . C^{'} = \frac{ϵ _{0} A}{d - t} .Since the thickness t of the foil is negligible (t \approx 0), the denominator remains d . Thus, the capacitance remains unchanged.

Practice this question

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A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor:

A

decreases

B

remains unchanged

C

becomes infinite

D

increases

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