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A parallel-plate air capacitor has a plate area of 100cm2 and separation 5mm. A potential difference of 300V is established between its plates by a battery. After disconnecting a battery, the space between the plates is filled by ebonite (K = 2.6). Find out initial and final capacitances of the capacitor. |
2.77 × 10−11 F, 4.6 × 10−11 F 1.77 × 10−11 F, 4.6 × 10−11 F 1.77 × 10−11 F, 6.6 × 10−11 F 1.77 × 10−13 F, 4.6 × 10−11 F |
1.77 × 10−11 F, 4.6 × 10−11 F |
$ C = \frac{\epsilon_0 A}{d} = \frac{8.85\times 10^{-12}\times 10^{-2}}{5\times 10^{-3}}= 1.77\times 10^{-11}$ $ C' = KC = 4.6\times 10^{-11}$ |
