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Question

# A parallel plate air condenser has a capacity of 4 μF. It is filled with two different dielectrics of constants 4 and 6 and they fill the upper and lower halves of the space as shown. The capacity now will be

A
19.2 μF
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B

9.6 μF

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C

20 μF

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D

10 μF

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Solution

## The correct option is C 20 μFVisualise two condensers each with plate area half that of the original condenser. So each will have a capacity 2 μF without dielectric. Now because of the dielectrics, the upper one is 12 μF and lower one is 8 μF and they are parallel.

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