A proton and an electron are placed 1.6 cm apart in free speace. Find the magnitude and nature of electrostatic force between them.

Two point charged bodies q_(1) = 3 muC , and q_(2) = 4 muC are separated by 2 m in air. Find the magnitude of electrostatic force between them.

Total charge Q is divided between two point objects in such a manner that electric force of repulsion between them is maximum when placed at a separation d from each other. What is the magnitude of this maximum possible electrostatic force between them?

Two protons are kept at a separation of 50Å. Fn is the nuclear force and F_(e ) is the electrostatic force between them, then

Ratio of gravitational force and electrostatic force between two electrons

(a) Two protons are placed at some separation in vacuum. Find the ratio of electric and gravitational force acting between them. (b) Two point charges are placed at separation 3 m in vacuum. What can be the minimum force between them. (c ) A charge Q is to be divided on two objects. What should be the value of the charges in the objects so that the force between them is maximum ? (d) Two insulating small spheres are rubbed against each other and placed 1.6 cm apart. If they attract each other with a force of 0.9 N , how many electrons were transferred from one sphere to the other during rubbing ?

Two tiny, spherical water drops, with identical charges of -1.00 xx 10^(-16)C , have a center-to-center separation of 1.20 cm. (a) What is the magnitude of the electrostatic force acting between them ? (b) How many excess electrons are on each drop, giving it its charge imbalance ?

Suppose the charge of a proton and an electron differ slightly. One of them is -e , the other is (e+Deltae) . If the net of electrostatic force and gravitational force between two hydrogen atoms placed at a distance d (much greater than atomic size) apart is zero. Then Deltae is of the order of [Given mass of hydrogen m_(h)=1.67xx10^(-27)kg ]