Analogy: Repel to each other :Like poles. Attract to each other:____

Two boys are sitting is very close to each other at a distance of 0.5 m from each other. If the mass of one boy is 40 kg and other is 50 kg, find the gravitational force between them.

The two auricles are separated from each other by _______.

The two ventricles are separated from each other by an ______.

Two bar magnets are placed close to each other with their opposite poles facing each other. In absence of other forces, the magnets are pulled towards each other and their kinetc energy increases. Does it contradict our earlier knowledge that magnetic forces cannot do any work and hence cannot increase kinetic energy of a system?

Two insulating small spheres are rubbed against each other and placed 1 cm apart. If they attract each other with a force of 0.1 N, how many electrons were transferred from one sphere to the other during rubbing?

Amino acids are attached with each other by______ bond

Real gas: Atoms interact with each other:: _____________: don not interact with each other.

Two circular loops are placed coaxially but separated by a distance. A battery is suddenly connected to one of the loops establishing a current in it. Will there be a current induced in the other loop? If yes, when does the current start and when does it end? Do the loops attract each other or do they repel?