Questions in Electrostatics

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Three equal charges are placed on the three corners of a square. If the force between \[{q_1}\] and \[{q_2}\]is \[{F_{12}}\] and that between \[{q_1}\]and \[{q_3}\] is \[{F_{13}}\], the ratio of magnitudes \[\frac{{{F_{12}}}}{{{F_{13}}}}\] is
\[ABC\] is a right angled triangle in which \[AB = 3\,cm\] and \[BC = 4\,cm\]. And $\angle ABC = \pi/2$. The three charges \[ + 15,\; + 12\] and \[ - 20\,e.s.u.\] are placed respectively on \[A\], \[B\] and \[C\]. The force acting on \[B\] is
With the rise in temperature, the dielectric constant \[K\]of a liquid
Two charges \[{q_1}\]and \[{q_2}\]are placed in vacuum at a distance \[d\] and the force acting between them is \[F\]. If a medium of dielectric constant 4 is introduced around them, the force now will be
Force of attraction between two point charges \[Q\] and – Q separated by \[d\,metre\] is \[{F_e}\]. When these charges are placed on two identical spheres of radius \[R = 0.3\,d\] whose centres are \[d\,metre\]apart, the force of attraction between them is
When \[{10^{14}}\] electrons are removed from a neutral metal sphere, the charge on the sphere becomes
A force \[F\] acts between sodium and chlorine ions of salt (sodium chloride) when put \[1\,cm\] apart in air. The permittivity of air and dielectric constant of water are \[{\varepsilon _0}\] and \[K\] respectively. When a piece of salt is put in water electrical force acting between sodium and chlorine ions \[1\,cm\] apart is
A conductor has \[14.4 \times {10^{ - 19}}coulombs\] positive charge. The conductor has (Charge on electron \[ = 1.6 \times {10^{ - 19}}coulombs\])
The value of electric permittivity of free space is
Two similar spheres having \[ + \,q\] and \[ - \,q\] charge are kept at a certain distance. \[F\] force acts between the two. If in the middle of two spheres, another similar sphere having \[ + \,q\] charge is kept, then it experience a force in magnitude and direction as

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