Discussion Forum



1)

A parallel plate air capacity 'C' farad, potential 'V' volt and energy 'E' joule. When the gap between the plates is completely filled with dielectric.


A) both V and E increases

B) both V and E decrease

C) V decreases , E increases

D) V increases , E decrease

Answer:

Option B

Explanation:

Note We have considered that the battery is kept disconnected from the capacitor.

When a dielectric being introduced inside the parallel plate capacitor, then potential difference gets reduced.

i.e,       V= $\frac {V_{0}}{k}$

 The energy decreases. i.e,   U= $\frac {U_{0}}{k}$

where, k is the dielectric constant