# Calculating equivalent capacitance.

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A parallel plate capacitor of capacitance $C$ without dielectrics is filled by a dielectric slab as shown here, the new capacitance will be?

When I solve it in two ways as shown here I got different results as $3.9C$ and $4C$ respectively, why? And which one is correct, please help.

asked Apr 9, 2019
retagged Apr 12, 2019