List of top Physics Questions on electrostatic potential and capacitance asked in KCET

A capacitor of capacitance C charged by an amount Q is connected in parallel with an uncharged capacitor of capacitance 2C. The final charges on the capacitors are

Nature of equipotential surface for a point charge is

Four metal plates are arranged as shown. Capacitance between $X$ and $Y (A \to$ Area of each plate, $d \to$ distance between the plates)

A parallel plate capacitor is charged and then isolated. The effect of increasing the plate separation on charge, potential and capacitance respectively are

A spherical shell of radius $10\, cm$ is carrying a charge $q$. If the electric potential at distances $5 \, cm, 10 \, cm$ and $15 \, cm$ from the centre of the spherical shell is $V_1, V_2$ and $V_3$ respectively, then respectively, then

In the given network, the value of $C$, so that an equivalent capacitance between $A$ and $B$ is $3\mu F$, is

A small conducting sphere of radius $r$ is lying concentrically inside a bigger hollow conducting sphere of radius $R$. The bigger and smaller spheres are charged with $Q$ and $q (Q > q)$ and are insulated from each other. The potential difference between the spheres will be

The potential of the electric field produced by a point charge at any point $(x, y, z)$ is given by $V= 3x^{2} + 5$ , where $x, y, z$ are in metres and $V$ is in volts. The intensity of the electric field at $(-2,1,0)$ is

A gang capacitor is formed by interlocking a number of plates as shown in figure. The distance between the consecutive plates is $0.885\, cm$ and the overlapping area of the plates is $5 \,cm^2$. The capacity of the unit is

A simple pendulum has a length $l$ and the mass of the bob is $m$. The bob is given a charge $q$ coulomb. The pendulum is suspended between the vertical plates of a charged capacitor. If $E$ is electric field strength between the plates, the time period of pendulum is given by

Four metal conductors having different shapes a) a sphere b) cylindrical c) pear d) Lightening conductor are mounted on insulating stands and charged. The one which is best suited to retain the charge for a longer time is

A spherical drop of capacitance $1 \mu \,F$ is broken into eight drops of equal radius. Then, the capacitance of each small drop is ........

SI unit of permittivity is ...........

An uncharged sphere of metal is placed inside a charged parallel plate capacitor. The lines of force will look like .........

A man, standing between two cliffs, claps his hands and starts hearing a series of echoes at intervals of one second. If the speed of sound in air is $340 \,ms ^{-1}$, the distance between the cliffs is ..........

A charge $q$ is placed at the centre of line joining two equal point charges each equal to $+Q$. The system of $3$ charges will be in equilibrium if $q$ is equal to

In the circuit shown, the effective capacitance between A and B is

$64$ small drops of mercury, each of radius $r$ and charge $q$ coalesce to form a big drop. The ratio of the surface density of charge of each small drop with that of the big drop is

While a capacitor remains connected to a battery, a dielectric slab is slipped between the plates.

n identical mercury droplets charged to the same potential $V$ coalesce to form a single bigger drop. The potential of new drop will be

In a charged capacitor the energy is stored in

A parallel plate air capacitor is charged to a potential difference of V volts. After disconnecting the charging battery the distance between the plates of the capacitor is increased using an insulating handle. As a result the potential difference between the plates

A point charge $A$ of charge $+4 \mu$C and another point charge B of charge $-1 \mu\,C$ are placed in air at a distance $1\, metre$ apart. Then the distance of the point on the line joining the charges and from the charge $B$, where the resultant electric field is zero, is (in metre)

$1000$ drops of water of radius $1\,cm$ each carrying a charge of $10\, esu$ combine to form a single drop. The capacitance of combined drop increases

A capacitor of capacitance 5μF is charged by a battery of emf 10V. At an instant of time, the potential difference across the capacitors is 4V and the time rate of change of potential difference across the capacitor is 0.6 Vs^-1. Then the time rate at which energy is stored the capacitor at the instant is