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