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

A) Decreases
B) Remain unchanged
C) Becomes infinite
D) Increases
Explanation

(b) From the formula ,
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ C = \ \frac{\varepsilon_{0}A}{d - t + \frac{t}{K}}$
$\Rightarrow$ Here, $\ K = \infty\ \ \ \ and\ t \rightarrow 0$
So, $\ \ \ \ \ \ \ \ \ C = \ \frac{\varepsilon_{0}A}{d + 0} = \ \frac{\varepsilon_{0}A}{d} = C_{0}$
[image:2_image115.emf]

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.