Two `alpha` particles are separated by a distance of 4 fermi (in air). Find the Columbian force between them.

Two electrons are separated by a distance of 1Å . What is the Coulomb force between them?

A north pole of strength 50 Am and south pole of strength 100 Am are separated by a distance of 10 cm in air. Find the force between them.

Two magnetic poles of strengths 40Am and 10 Am are separated by a distance of 20 cm in air. Find the force between them. If the distance is reduced to 10 cm, find the force.

Two charged particles are a distance 1 mm apart. Find the minimum Coulomb force between them.

The force between two alpha -particles separated by a distance .r. is F. In order to have same force F, the distance between singly ionized chlorine atoms separated by a distance of

The force between two alpha particles separated by a distance 'r' is F. In order to have same force the distance between single ionized chlorine atoms separated by a distance of

Two particles are placed in air seperated by a distance of 10 cm. 20 esu charge is distributed between them in such a way that the force of repulsion between them is maximum. What is the value of this maximum repulsive force in dyne?