NEET
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- Capacitance
NEET · Physics · Capacitance
A dielectric slab of thickness d is inserted in a parallel plate...
A dielectric slab of thickness d is inserted in a parallel plate capacitor whose negative plate is at (\mathrm{x}=0) and positive plate is at (\mathrm{x}=3 \mathrm{~d}). 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
Options
- Aa and c are correct
- Bb and c are correct
- Ca, b and c are correct
- DAll are correct
Correct answer
B. b and c are correct
Step-by-step solution
The plates of a parallel plate capacitor are, not exactly parallel. The surface charge density therefore:
(a) Is higher at the closer end
(b) The surface charge density will not be uniform
(c) Each plate will have the same potential at each point
(d) The electric field is smallest where the plates are closest
(1) only a is correct
(b) only b & c are correct
(3) a & c are correct
(4) a, b & c are correct