Two charges of magnitude 10 units and 20 units are separated by a certain distance. Now, both the charges are brought in contact and again separated to initial separation. What will be the ratio of initial and final electrostatic force?

Q. Two equal metal balls are charged to $10$ and $20$ units of electricity. They are brought in contact with each other and then again separated to the origin distance. The ratio of forces between the two balls before and after contact is :

Q. The Electrostatic Force between two identical charges $q_0$ separated by a distance $r_0$ is $F_0$. The magnitudes of each charge and the separation distance are tripled. Find the new Electrostatic Force in terms of $F_0$.

Q. Two identical spheres having charges $+q_1$ and $+q_2$ are kept at a distance "d". These two are brought in contact with an insulated handle and again separated to the same distance. Find the force $F_2$ between them in terms of initial force $F_1$.

Q. Two identical small conducting spheres having unequal positive charges $q_1$ and $q_2$ are separated by a distance r. If they are now made to touch each other and then separated again to the same distance, the electrostatic force between them in this case will be :

Q. Two identical metal spheres separated by a distance x are charged to $Q$ and $-2Q$ . They are brought in contact with each other and then again separated to original distance. The ratio of the magnitudes of the forces between the two spheres before and after contact is :