List of top Physics Questions on coulombs law asked in KCET

Two smalI spheres of masses $M_1 $ and $M_2$ are suspended by weightless insulating threads of lengths $ L_1$ and $ L_2$. The spheres carry charges $Q_1$ and $Q_2$ respectively. The spheres are suspended such that they are in level with one another and the threads are inclined to the vertical at angles of $\theta_1 $ and $\theta_2$ as shown. Which one of the following conditions is essential, if $\theta_1 = \theta_2$ ?

Two identical metal spheres charged with $+12 \mu F$ and $-8 \mu F$ are kept at certain distance in air. They are brought into contact and then kept at the same distance. The ratio of the magnitudes of electrostatic forces between them before and after contact is

Two equal negative charges $-q$ each are fixed at points $(0, -a)$ and $(0,a)$ on $y-axis$. A positive Charge $Q$ is released from rest at the point $(2a, 0)$ on the $x-axis$. The charge $Q$ will

A point charge A of +10µC and another point charge B of +20µC are kept Im apart in free space. The electrostatic force on A due to B is \(\overrightarrow{F_1}\), and the electrostatic force on B due to A is \(\overrightarrow{F_2}\). Then