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 with distance 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;

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Sol. 1st part has di-electric;

by E =
; Q remain constant so electric field in region 1 varies same as region 2, so now electric field graph of obtain by extend E of region 2
now V is constant so by E =
; electric field graph directly obtain by joining A and B.
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