The distance between the plates of a plane capacitor is equal to d. Between them is a plate of a dielectric material with a dielectric constant e1 = 2.1 thickness d1 = 4,5 mm. The voltage across the capacitor is equal to U0 = 85 V. If you take out an insulator, the voltage across the capacitor becomes equal to U = 110 V. Determine the distance d.

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