Embibe Experts Solutions for Chapter: Capacitance, Exercise 1: BEGINNER'S BOX - 1

Assertion:- On the sharp edges of charged conductor air get ionised.

Reason:- Potential is higher at the sharp edges of conductor.

Assertion: Net charge density inside a conductor is zero.

Reason: Equal and opposite charges are present in conductor.

Assertion: Charge given to a conductor appears on its surface.

Reason: When charge appears on surface then potential energy of conductor becomes minimum.

When $1.0\times {10}^{12}$ electrons are transferred from one conductor to another, a potential difference of $10 \mathrm{V}$ appears between the conductors. Calculate the capacitance of the two-conductor system.

The graph shows the variation of voltage $V$ across the 

plates of two capacitors $A$ and $B$ with charge $Q$.

Which of the two capacitors has larger capacitance?

For flash pictures, a photographer uses a $30 \mu \mathrm{F}$ capacitor and a charger that supplies $3\times {10}^3 \mathrm{volt}$. Calculate the charge and the energy spent for each flash.

Two capacitors $C_1$ and $C_2$ have an equal amount of energy stored in them. What is the ratio of potential differences across their plates?

A parallel plate capacitor has rectangular plates with dimensions $6.0 \mathrm{cm}\times 8.0 \mathrm{cm}$. If the plates are separated by a sheet of Teflon $\left(K=2.1\right)$ $1.5 \mathrm{mm}$ thick, how much energy is stored in the capacitor when it is connected to a $12 \mathrm{V}$ battery?