The distance between two plates of a cap...

The distance between two plates of a capacitor is d and its capacitance is `C_1`, when air is the medium between the plates. If a metal sheet of thickness `2d/3` and of the same area as plate is introduced between the plates, the capacitance of the capacitor becomes `C_2`. The ratio `C_2/ C_1` is

0.12569444444444

0.084027777777778

0.16736111111111

0.042361111111111

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