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

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

Two spherical balls of mass 10 kg each are placed 10 cm apart. Find the gravitational force of attraction between them.

(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 ?

Suppose the charge of a proton and an electron differ slightely. 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 ]

Find the ratio of the electric and gravitational forces between two protons.

A point charge +Q is placed at the centroid of an equilateral triangle. When a second charge +Q is placed at a vertex of the triangle, the magnitude of the electrostatic force on the central charge is 8 N. The magnitude of the net force on the central charge when a third charge +Q is placed at another vertex of the triangle is

Two point charges q_(1)=2xx10^(-3) C and q_(2)=-3xx10^(-6) C are separated by a distance x = 10 cm. Find the magnitude and nature of the force between the two charges.

Two spherical balls of mass 10 kg each are placed 100 m apart. Find the gravitational force of attraction between them.

A hydrogen atom contains one proton and one electron. It may be assumed that the electron revolves in a circle of radius 0.53 angstrom (1 angstrom = 10^(-10) m and is abbreviated as A) with the proton at the centre. The hydrogen atom is said to be in the ground state in this case. Find the magnitude of the electric force between the proton and the electron of a hydrogen atom in its ground state.

Two equal charges are placed at a separtion of 1.0 m. What should be the magnitude of the charges so that the force between them equals of a 50 kg person?