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MA_775_DIABLO [31]
3 years ago
6

An air capacitor is made by using two flat plates, each with area A, separated by a distance d. Then a metal slab having thickne

ss a (less than d) and the same shape and size as the plates is inserted between the, parallel to the plates and not touching either plate
Physics
1 answer:
Anit [1.1K]3 years ago
4 0

Answer:

C' = \frac{A\epsilon_{o}}{d - a}

Solution:

As per the question:

Area of the plates is given by 'A'

Separation distance between the plates is 'd'

Now, after insertion of the metal plate with same area 'A' and thickness, a < d

in between the plates, the capacitance of the capacitor changes.

The capacitance of the air capacitor (parallel plate) is generally given by:

C = \frac{A\epsilon_{o}}{d}

where

C = Capacitor's capacitance

\epsilon_{o} = Permittivity of the free space

Now, when the metal slab is inserted the distance is reduced to (d - a)

Thus

C' = \frac{1}{2}(\frac{A\epsilon_{o}}{\frac{d - a}{2}})

C' = \frac{A\epsilon_{o}}{d - a}

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Verified by Toppr

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