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WAEC Physics 2020 Paper

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Question : 5

Total: 51

How would the capacitance of a parallel plate capacitor be affected if the distance of separation of its plates is decreased? It will

increase in value
decrease slightly
remain unchanged
drop to zero

Solution:

Concept:

Capacitance of a parallel plate capacitor is inversely proportional to the plate separation.

Explanation:

For a parallel plate capacitor,

C = \frac{\varepsilon A}{d}

, where

d

is the distance between the plates.

When

d

is decreased, the fraction

\frac{1}{d}

becomes larger.

Therefore, the capacitance

C

increases in value.

Answer:

It will increase in value.

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