Question

Capacitance of a capacitor made by a thin metal foil is . If the foil is folded with paper of thickness 0.15 mm, dielectric constant of paper is 2.5 and width of paper is 400 mm, the length of the foil will be :

A

0.34 m

B

1.33 m

C

13.4 m

D

33.9 m

Medium

Solution

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Correct option is
D

33.9 m

Here, let the length be
width is,
thickness,

As capacitance for parallel plate capacitor is, 

Option D is correct.

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