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A dielectric slab of thickness d is inse...

A dielectric slab of thickness `d` is inserted in a parallel plate capacitor whose negative plate is at `x = 0` and positive plate is at `x = 3d`. The slab is equidistant from the plates. The capacitor is given some charge. As one goes from 0 to `3d`:

A

the magnitude of the electric field remains the same .

B

the direction of the electric field remains the same

C

the electric potential increases continuously

D

the electric potential increases at first , then decreases and again increases.

Text Solution

Verified by Experts

The correct Answer is:
(b,c)
(a) Magnitudes of electric fields in the slab and outside the slab are `(E_(0))/(K)andE_(0)`.
Refer to figures (i) and (ii),
`E_(0)gt(E_(0))/(K)`.
Option (a) is incorrect .
(b) The direction of electri field remains the same . Option (b) is therefore correct.
(c) Electric field lines always flow from higher potential to lower potential.
the electric potential V, therefore, increase continuously as one goes from O to 3d. `OA||BC`.
Slope of (OA) `gt` slope of AB.
Option (c ) is correct.
(d) The option is incorrect.
Refer to figure (iii).
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