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The distance between the parallel plates...

The distance between the parallel plates of a charged condenser is `d= 5cm` and the intensity of the field `e = 300V//cm`. A slab of dielectric constant `k= 5` and `1 cm` wide is inserted parallel to the plates. Determine the potential difference between the plates before and after the slab is inserted. If the slab is replaced by a metal plates so that the final potential difference remains unchanged, what be the thickness ofthe plate?

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