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A parallel-plate capacitor has plates with an area of 1.3×10?2m^2 and a separation of 0.83mm. The space between the plates is filled with a dielectric whose dielectric constant is 1.8.

(a) What is the potential difference between the plates when the charge on the capacitor plates is 4.2mu C ?

(b) Calculate the potential difference for the case where the dielectric constant is 4.0.

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