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An air capacitor is given a charge of $2 \mu C$ raising its potential to $200\; V$. If on inserting a dielectric medium, its potential falls to 50 V, what is the dielectric constant of the medium?

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$K=\large\frac{V_0}{V}=\frac{200}{50}$$=4$
Hence A is the correct answer.
answered Jun 24, 2014 by meena.p
 

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