Why there is an attractive force between particles of atoms?Why a repulsive force does not exists between them?

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Q. Identify the following force:
1)Force between the charged particles.
2)Attractive for unlike charges and repulsive for like charges.
3)It does not need any intervening medium.
4) It is not the strongest force.

Q. Inspite of mutual repulsion between the protons and no electric force between neutrons, a number of protons and neutrons do stay together to form stable nuclei. Which of the following are reasons for this?

1

. Another type of force, called nuclear force works between these particles when they are very close to each other

2

. The neutrons keep the protons apart so that there is no repulsion between them

3

. The nuclear force is always attractive and does not depend on the charge of the particles
Select the correct answer from the codes given.

The adjacent figure shows an interaction force between two particles A and B against the separation between them, when the separation between them changes from zero to infinity. Parts of the curve above and below the x-axis denote attractive and repulsive forces respectively. Then, which of the following statement is incorrect?

Q. The given plot shows the variation of U, the potential energy of interaction between two particles with the distance separating them r.

1. B and D are equilibrium points
2. C is a point of stable equilibrium
3. The force of interaction between the two particles is attractive between points C and D and repulsive between D and E
4. The force of interaction between particles is repulsive between points E and F.

The correct statements are:

Why two stones do not come closer, even if there is gravitational force of attraction between them ?

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