Questions in Electrostatics

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A drop of ${10^{ - 6}}kg$ water carries ${10^{ - 6}}C$ charge. What electric field should be applied to balance its weight (assume $g = 10m/{s^2})$
A charged particle of mass 0.003 gm is held stationary in space by placing it in a downward direction of electric field of $6 \times {10^4}N/C$. Then the magnitude of the charge is
Two point charges $+ 9e$and $+ e$are at 16 cm away from each other. Where should another charge q be placed between them so that the system remains in equilibrium
If 3 charges are placed at the vertices of equilateral triangle of charge ‘q’ each. What is the net potential energy, if the side of equilateral $\Delta $ is l cm
The distance between charges $5 \times {10^{ - 11}}C$ and $- 2.7 \times {10^{ - 11}}C$ is 0.2 m. The distance at which a third charge should be placed in order that it will not experience any force along the line joining the two charges is
If identical charges $( - q)$ are placed at each corner of a cube of side b, then electric potential energy of charge $( + q)$ which is placed at centre of the cube will be
An electron having charge ‘e’ and mass ‘m’ is moving in a uniform electric field E. Its acceleration will be
Cathode rays travelling from east to west enter into region of electric field directed towards north to south in the plane of paper. The deflection of cathode rays is towards
An $\alpha $ -particle is accelerated through a potential difference of 200V. The increase in its kinetic energy is
A simple pendulum of period $T$ has a metal bob which is negatively charged. If it is allowed to oscillate above a positively charged metal plate, its period will

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