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A parallel-plate capacitor is filled wit...

A parallel-plate capacitor is filled with a dielectric up to one-half of the distance between the plates.The manner in which the potential between the plates varies is illustrated in the figure. Which half `(1 or 2)` of the space between the plates is filled with the dielectric and what will be the distribution of the potential after the dielectric is taken out of the capacitor provided that (a) the charges on the plates are conserved or (b) the potential difference across the capacitor is conserved?

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