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Physics-

General

Easy

Question

A parallel plate condenser is connected with the terminals of a battery. The distance between the plates is $6 m m$ . If a glass plate (dielectric constant $K equals 9$ ) of $4.5 m m$ is introduced between them, then the capacity will become

2 times
The same
3 times
4 times

The correct answer is: 3 times

$C proportional to fraction numerator 1 over denominator d end fraction$ Þ $fraction numerator C subscript m e d i u m end subscript over denominator C subscript a i r end subscript end fraction equals fraction numerator d over denominator d minus t plus fraction numerator t over denominator K end fraction end fraction equals fraction numerator 6 over denominator 6 minus 4.5 plus fraction numerator 4.5 over denominator 9 end fraction end fraction equals fraction numerator 6 over denominator 2 end fraction equals 3$

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