List of top Physics Questions on Electrostatics asked in AP EAPCET

216 identical spherical drops each having a positive charge of \[ 10\,\text{nC} \] combine to form a big spherical drop. If the radius of each small drop is \[ 3\,\text{mm}, \] then the capacitance and electric potential of the big drop are respectively

The surface charge density of an isolated sphere A of radius $2\text{ cm}$ having a charge of $+10\text{ }\mu\text{C}$ is twice the surface charge density of another sphere B of radius $3\text{ cm}$. If the two spheres are joined and then separated, the charges on the sphere A and B after separation are respectively:

Two electric charges \(+3.2\times10^{-19}\,\text{C}\) and \(-3.2\times10^{-19}\,\text{C}\) are placed \(2.4\,\text{\AA}\) apart to form an electric dipole. It is placed in a uniform electric field of intensity \(4\times10^5\,\text{V m}^{-1}\). The work done to rotate the electric dipole from equilibrium position by \(180^\circ\) is:

Two similar rods of length \( l=1 \text{ m} \) carrying equal charges \( (q) = 10^{-8} \text{ C} \) are placed as shown in figure. The electric field at point 'O' approximately is, if \( d=0.25 \text{ m} \):

A particle of charge 'q' and mass 'm' starts moving from the origin under the action of electric field, \( \vec{E}=E_{0}\hat{i} \) with a velocity \( v=v_{0}\hat{j} \). The time taken to increase its velocity to \( \frac{\sqrt{5}}{2} v_0 \) is:

\( 1\,\mu\text{C} \), \( -1\,\mu\text{C} \) charges are placed at a distance of 5 cm in forming a dipole. The amount of torque required to place this dipole perpendicular to an electric field of \( 3\times10^{5}~\text{NC}^{-1} \) is given by:

Two identical balls each of mass $\frac{40}{3}$ g carry equal and opposite charge. They are suspended from a horizontal plate by silk threads each of length 1 m with a separation of 1.5 m between points of suspension. At equilibrium, if the distance between the balls is 30 cm then magnitude of charge on each ball is (Acceleration due to gravity $= 10 \text{ ms}^{-2}$)

The electrostatic force between two charges $q_1$ and $q_2$ separated by a distance $r$ in vacuum is $F$. If a dielectric medium of dielectric constant $K$ is introduced between them, the new force is

Work done in moving a charge on an equipotential surface is:

Two charges \( 2\mu\text{C} \) and \( 8\mu\text{C} \) are placed \( 2\text{ m} \) apart. Force between them is:

Twenty seven drops of same size are charged at $220\text{ V}$ each. They combine to form a bigger drop. Calculate the potential of the bigger drop.}

As shown in the figure, two tiny conducting balls of identical mass and identical charge are suspended by two non-conducting threads of equal length \(L\). The separation between the balls in equilibrium is \(x\) and is related to \(L\) as \(x \propto L^{\beta}\). If \(\theta\) is assumed to be very small then the value of \(\beta\) is:

A particle of charge \(7 \, \mu C\) is moved away from an infinite non-conducting sheet of surface charge density \(5.0 \, \mu C\, m^{-2}\) to a point at a distance of \(5.0 \, cm\). The work done by the field due to the sheet is \(\left(\frac{1}{4\pi\varepsilon_0} = 9 \times 10^9 \, SI \, units\right)\)