Two identical metal spheres posses `+60C` and `-20C` of charges .They are brought in contact and then separated by `10cm` .the force between them 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 -

Two metal sphere of capacitance C_(1) andC_(2) carry some charges. They are put in contact and then separated. If final charges Q_(1) and Q_(2) on them, then:

Two identical conducting balls A and B have charges- Q and + 3Q respectively. They are brought in contact with each other and then separated by a distance d part. Find the nature of the Coulomb force between them.

Two identical conducting balls A and B have charges- Q and + 3Q respectively. They are brought in contact with each other and then separated by a distance d part. Find the nature of the Coulomb force between them.

The identical metal spheres of radius 10 cm are in contact with each other. If density of the metal is 10 g/cc, the graviational force between the spheres is (pi^(2)=10)