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 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 -

A charge placed at a distance from an electric dipole on its axis experiences a force F. If the distance be doubled , the force will become

Two electrically charged particles, having charges of different magnitudes, when placed at a distance from each other, experience a force of attraction .F. These two particles are put in contact and again placed at the same distance from each other. What is the nature of new force between them?

Two electrically charged particles , having charges of different magnitudes , when placed at a distance 'd' from each other , experience a force of attraction 'F' . These two particles are put in contact and again placed at the same distance from each other. What is the nature of new force between them ?

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.