Three charges are placed at the vertices of an equilateral triangle of side ‘$a$’ as shown in the following figure. The force experienced by the charge placed at the vertex $A$ in a direction normal to $BC$ is
${Q^2}/(4\pi {\varepsilon _0}{a^2})$
$ - {Q^2}/(4\pi {\varepsilon _0}{a^2})$
Zero
${Q^2}/(2\pi {\varepsilon _0}{a^2})$
According to Coulomb's Law, which is correct relation for the following diagram?
$12$ positive charges of magnitude $q$ are placed on a circle of radius $R$ in a manner that they are equally spaced. A charge $Q$ is placed at the centre, if one of the charges $q$ is removed, then the force on $Q$ is
Identify the wrong statement in the following. Coulomb's law correctly describes the electric force that
$(a)$ Explain the meaning of the statement ‘electric charge of a body is quantised’.
$(b)$ Why can one ignore quantisation of electric charge when dealing with macroscopic i.e., large scale charges?
Two point charges placed at a certain distance $r$ in air exert a force $F$ on each other. Then the distance $r'$ at which these charges will exert the same force in a medium of dielectric constant $k$ is given by