Download App

Electrostatic Potential and Capacitance — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsElectrostatic Potential and Capacitance1 Mark
MCQ
A capacitor is charged by using a battery which is then disconnected. A dielectric slab is introduced between the plates which results in:
  • A
    Increase in the potential difference across the plates and reduction in stored energy but no change in the charge on the plates.
  • ✓
    Decrease in the potential difference across the plates and reduction in the stored energy but no change in the charge on the plates.
  • C
    Reduction of charge on the plates and Increase of potential difference across the plates.
  • D
    Increase in stored energy but no change in potential difference across the plates.
✓

Answer

Correct option: B.
Decrease in the potential difference across the plates and reduction in the stored energy but no change in the charge on the plates.

If a dielectric slab of dielectric constant K is filled in between the plates of a capacitor after charging the capacitor $($i.e., after removing the connection of battery with the plates of capacitor$)$ the potential difference between the plates reduces to $\frac{1}{\text{K}}$​ times and the potential energy of capacitor reduces to$\frac{1}{\text{K}}$times but there is no change in the charge on the plates.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from Electrostatic Potential and Capacitance→Electrostatic Potential and Capacitance — all question types→Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

Two equal negative charge $-q$ are fixed at the fixed points $(0,\,a)$ and $(0,\, - a)$ on the $Y$-axis. A positive charge $Q$ is released from rest at the point $(2a,\,0)$ on the $X$-axis. The charge $Q$ will
→
The diameter of each plate of an air capacitor is $4\,cm$. To make the capacity of this plate capacitor equal to that of $20\,cm$ diameter sphere, the distance between the plates will be
→
Two points $P$ and $Q$ are maintained at the potentials of $10\  V$ and $- 4\ V$, respectively. The work done in moving $100$ electrons from $P$ to $Q$ is
→
In the following transistor amplifier circuit $\beta=50 . V_{C E}$ of the transistor is .......... $V$
→
This question has Statement $1$ and Statement $2$. Of the four choices given after the Statements, choose the one that best describes the two Statements.

Statement $1$ : A pure semiconductor has negative temperature coefficient of resistance.

Statement $2$ : On raising the temperature, more charge carriers are released into the conduction band

→
The radius of curvature of convex surface of a thin plano-convex lens is 15 cm and refractive index of its material is 1.6. The power of the lens will be
→
Lenz’s law is expressed by the following formula (here $e$ = induced $e.m.f$., $\phi$ = magnetic flux in one turn and $N$ = number of turns)
→
A coil of inductance L is carrying a steady current i. What is the nature of its stored energy
→
The nuclear activity of a radioactive element becomes $\left(\frac{1}{8}\right)^{\text {th }}$ of its initial value in $30\, years.$ The half-life of radioactive element is $....\,years.$
→
If an electron and a positron annihiliate, then the energy released is
→