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A parallel plate condenser has a capacitance $50 \mu \mathrm{F}$ in air and $110 \mu \mathrm{F}$ when immersed in an oil. The dielectric constant ' $k$ ' of the oil is
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2.20
$C_{\text {medium }}=K C_{\text {air }} \Rightarrow K=\frac{C_{\text {medum }}}{C_{\text {air }}}=\frac{110}{50}=2.20$
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