A dielectric slab of thickness d is inserted in a parallel plate capacitor whose negative plate is at 
and positive plate is at 
. The slab is equidistant from the plates. The capacitor is given some charge. As one goes from 0 to 3d
Text Solution
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After the introduction of dielectric slab, direction of electric field remains perpendicular to plate and is directed from positive to negative plate.
Electric field in air 
and electric field in dielectric 
Positive plate is at higher potential and negative plate is at lower potential. So, electric potential increases continuously as we more from 
to 
.
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