Questions in Electrostatics

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When a proton is accelerated through 1V, then its kinetic energy will be
An electron enters between two horizontal plates separated by 2mm and having a potential difference of 1000V. The force on electron is
Two metal spheres of radii ${R_1}$ and ${R_2}$ are charged to the same potential. The ratio of charges on the spheres is
Electric charges of $+ 10\mu C,\; + 5\mu C,\; - 3\mu C$ and $+ 8\mu C$ are placed at the corners of a square of side $\sqrt 2 $m. the potential at the centre of the square is
What is the magnitude of a point charge which produces an electric field of 2 N/coulomb at a distance of 60 cm ($1/4\pi {\varepsilon _0} = 9 \times {10^9}N - {m^2}/{C^2}$)
The electric field due to a charge at a distance of 3 m from it is 500 N/coulomb. The magnitude of the charge is $\left[ {\frac{1}{{4\pi {\varepsilon _0}}} = 9 \times {{10}^9}\frac{{N - {m^2}}}{{coulom{b^2}}}} \right]$
Two charges of $4\mu C$ each are placed at the corners A and B of an equilateral triangle of side length 0.2 m in air. The electric potential at C is $\left[ {\frac{1}{{4\pi {\varepsilon _0}}} = 9 \times {{10}^9}\frac{{N{\rm{ - }}{m^2}}}{{{C^2}}}} \right]$
Electric field strength due to a point charge of $5\mu C$ at a distance of 80 cm from the charge is
Ten electrons are equally spaced and fixed around a circle of radius R. Relative to V = 0 at infinity, the electrostatic potential V and the electric field E at the centre C are
Two positive point charges of $12\mu C$ and $8\mu C$ are 10cm apart. The work done in bringing them 4 cm closer is

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