WRT: http://groups.yahoo.com/group/mukto-mona/message/47905
Subimal Said:
"1. Are you still insisting that your above statement is correct? Don't you agree that it is not nuclear force but the electrostatic force that keeps the elctron moving in its orbit about the nucleus.
2. What do you mean by "counterbalance" ? You mean centripetal force=centrifugal force? Do you want to say that net force on the electron is zero? A little reflection should be able to convince you that net force on the revolving electron is not zero. Also, it should be remembered that 'centrifugal' force is a fictitious force and it would be an absurd idea to think that centrifugal force counterbalances centripetal force."
My Response:
Nuclear force is short ranged, and only works inside the nucleus to provide binding energy for the nucleons. The net charge of the nucleus is positive, which provides electrostatic force on the electrons. This attractive force is strongest for electrons in the inner most shell, and in order for electrons to be able to stay outside the nucleus, electrons have to revolve around the nucleus with certain speed, thus generating needed centrifugal force for that orbit to balance centripetal electrostatic force.
Let me give you another example. Lets secure a stone onto one end of a rope and hold the other end. Now try to whirl. Pretty soon the attractive centripetal force provided by the rope and the centrifugal force due to motion of the stone will balance and the stone will keep on revolving around you as long as it maintains an optimum speed for its orbit. If the speed increases too much from the optimum speed, the string could break. If the speed decreases too much, the stone will come toward you to hit you. The same mechanism is in play for the nucleus and the electron. To maintain an equilibrium condition, these two forces have to balance.
I hope it will clarify misconception.
Jiten Roy
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