A capacitor is charged by using a battery,whi | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(C) When the battery is disconnected,the charge $Q$ on the capacitor plates remains constant because there is no path for the charge to flow.When a di

Vedclass · Accepted Answer

Decrease in the potential difference across the plates,reduction in stored energy,but no change in the charge on the plates.

Vedclass · Answer

(C) When the battery is disconnected,the charge $Q$ on the capacitor plates remains constant because there is no path for the charge to flow.When a dielectric slab of dielectric constant $K$ is inserted,the capacitance increases from $C$ to $C' = KC$.Since $Q = CV$,the new potential difference $V'$ is given by $V' = Q / C' = Q / (KC) = V / K$. Since $K > 1$,the potential difference $V$ decreases.The stored energy $U$ is given by $U = Q^2 / (2C)$. The new energy $U'$ is $U' = Q^2 / (2KC) = U / K$. Since $K > 1$,the stored energy decreases.Therefore,the potential difference decreases,the stored energy decreases,and the charge on the plates remains constant.

$A$ capacitor is charged by using a battery,which is then disconnected. $A$ dielectric slab is then inserted between the plates. What is the result?

Similar Questions

$A$ cell of $emf$ $E$ and internal resistance $r$ is connected in series with an external resistance $nr$. Then,the ratio of the terminal potential difference to $emf$ is

What should be the angular speed of the earth,so that a body lying on the equator may appear weightless? $(g = 10\,m/s^2, R = 6400\,km)$

Which of the following is not considered as an organometallic compound?

Which plant-derived latex is used as an alternative to rubber?

If $\frac{(1+i) x-i}{2+i}+\frac{(1+2 i) y+i}{2-i}=1$,then $(x, y)$ is equal to

Vedclass Test Series

Exam Paper Generator

Online Exam Module