Questions in electrostatics

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Three particles, each having a charge of $10\,\mu C$are placed at the corners of an equilateral triangle of side $10\,cm$. The electrostatic potential energy of the system is (Given $\frac{1}{{4\pi {\varepsilon _0}}} = 9 \times {10^9}N - {m^2}/{C^2}$)
The electric field near a conducting surface having a uniform surface charge density $\sigma $ is given by
There is an electric field $E$ in X-direction. If the work done on moving a charge $0.2\,C$ through a distance of $2\,m$ along a line making an angle $60^\circ $ with the X-axis is 4.0, what is the value of $E$
Four equal charges $Q$ are placed at the four corners of a square of each side is $'a'$. Work done in removing a charge – Q from its centre to infinity is
A particle $A$ has charge $+ q$ and a particle $B$ has charge $+ \,4q$ with each of them having the same mass $m$. When allowed to fall from rest through the same electric potential difference, the ratio of their speed $\frac{{{v_A}}}{{{v_B}}}$ will become
Deutron and $\alpha - $ particle are put $1\,{\AA}$ apart in air. Magnitude of intensity of electric field due to deutron at $\alpha - $ particle is
Angle between equipotential surface and lines of force is
Below figures (1) and (2) represent lines of force. Which is correct statement
The unit of electric field is not equivalent to
A flat circular disc has a charge $+ Q$ uniformly distributed on the disc. A charge $+ q$ is thrown with kinetic energy $E$towards the disc along its normal axis. The charge $q$ will

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