A $10\,\mu C$ charge is divided into two parts and placed at $1\,cm$ distance so that the repulsive force between them is maximum. The charges of the two parts are :
$9\,\mu C , 1\,\mu C$
$5\,\mu C , 5\,\mu C$
$7\,\mu C , 3\,\mu C$
$8\,\mu C , 2\,\mu C$
A charge $q$ is placed in the middle of a line joining the two equal and like point charge $Q$. This charge $q$ will remain in equilibrium for which value of $q$ is
Write limitations of Coulomb’s law.
Two identical charged spheres are suspended by strings of equal lengths. The strings make an angle of $30^{\circ}$ with each other. When suspended in a liquid of density $0.8 \;g\, cm ^{-3}$, the angle remains the same. If density of the material of the sphere is $1.6\; g \,cm ^{-3}$, the dielectric constant of the liquid is
A charge $q$ is placed at the centre of the line joining two equal charges $Q$. The system of the three charges will be in equilibrium, if $q$ is equal to
Six charges are placed at the corner of a regular hexagon as shown. If an electron is placed at its centre $O$, force on it will be: