Two metallic shells with charges `q ` each are kept in air with their centre distance r .The magnitude of electrostatic force between them is `(K=(1)/(4 pi varepsilon_(0)))`

In the following question a statement of assertion (A) is followed by a statement of reason (R ) A : Two large conducting spheres carrying charges Q_(1) and Q_(2) are brought close to each other. The magnitude of electrostatic force between them is exactly given by Q_(1) Q_(2)// 4 pi epsilon_(0) r^(2) , where r is the distance between their centres. R: Here charges Q_(1) and Q_(2) can be assumed to be concentrated at the centres of their respective spheres.

Inside a neutral hollow conducting sphere of radius X and centre C, a point charge q is placed as shown in the figure. Another point charge q_1 , is placed outside the sphere at distance d from centre. The net- electrostatic force on charge q placed at the centre is K=1/(4piepsilon_0)

A and B are two identical point sized metal spheres each holding the same charge .q.. These two are separated by certain distance and the mutual electrostatic force between them is F. If a third identical uncharged sphere .C. is touched with A and kept exactly at the midpoint of line joining A and B, what is the resulting force on C and its direction?

Five charges each q are placed at five corners regular pentagon. Distance from corner to the centre of pontagon is r . Then (K=(1)/(4pi epsilon_(0)))

Two point charges of 10 C each are kept at a distance of 3 m in vacuum. Calculate their electrostatic potential energy.

A charge Q is divided into two charge q and Q-q. The value of q such that the force between them is maximum is

Two large conduction spheres carrying charges Q_(1) and Q_(2) are brought close to each other. Is the magnitude of the force between them exactly given by Q_(1)Q_(2)//4piepsilon_(0)r^(2) . Where r is the distance between their centers.

In a regular hexagon each corner is at a distance .r. from the centre. Identical charges of magnitude .Q. are placed at 5 corners. The field at the centre is (K = (1)/(4pi in_(0)))

There are two charge +1mu c and +2muc kept at certain separation ,the ratio of electrostatic forces acting on them will be in the ratio

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