Two small conducting spheres of equal radius have charges `+ 10 muC` and `-20 muC` respectively and placed at a distance R from each other. They experience force `F_(1)`. If they are brought in contact and separated to the same distance, they experience force `F_(2)`. The ratio of `F_(1)` to `F_(2)` is

Two small conducting spheres have charges 2.1 nC and -0.1 nC are touched to each other and then separated by a distance of 0.5 m. Find the force between them

Two small identical spheres having charges +10 muC and - 90muC attract each other with a force of F newton . If they are kept in contant and then separated by the same distance, the new force between them is -

Two charges of values 2 muC and -50 muC are placed at a distance of 6 cm from each other. The distance of the point (in cm) from the bigger charge where the electric intensity will be zero is :

Two point charges , -2muC and +6muC are fixed on a table at a distance 10 cm from each other. Where should the third charge be placed so that no net force acts on it ?

Two tiny conducting spheres are identical any carry charges of -20.0 mu C and +50.0 muC . They are separated by a distance of 2.50 cm. The spheres are brought into contact and then separated to a distance of 2.50 cm. Determine the magnitude of the force that each sphere now experiences, and state whether the force is attractive or repulsive.

Two spheres carrying charges +6muC and +9muC , separated by a distance d, experiences a force of repulsion F. When a charge of -3muC is given to both the spheres and kept at the same distance as before, the new force of repulsion is

Two similar very small conducting spheres having vharges 40 muC and -20 muC are some distance apart. Now they are touched and kept at the same distance. The ratio of the initial to the final force between them is :

If two identical spheres having charge 16muC and -8mu C are kept at certain distance apart, then the force is F. They are touched and again kept at the same distance, the force becomes