I am asked to make a model in physics. I have an idea, please tell me would it work or not.
It is:
I have thought that if i give negative charge to two a metal plates such that it one metal plate has breadth double of the other. Then, if i take the metal plate with smaller width over the metal plate with larger width and fix the latter metal plate on an insulating material then according to coulomb's law the former plate will be lifted upwards due to the force of replulsion between the two plates. 
Will it work or there is some problem with it. If any please tell me about it and suggest a way to resolve the problem.
I will be obliged.

Asked by shaktiisgreat000 | 5th Aug, 2014, 08:06: PM

Expert Answer:

When you give negative charge to both the metal plates, then according to Coulomb's law there will be a force of repulsion between the two plates.
Now, the question is how will you fix them together. If you use any adhesive material then the adhesive force will be greater than the force of repulsion and the plates will not repel. Then the solution is to give a large amount of negative charge to the plates which is not feasible.
What you can do is try and fix the plates with plastic rings at the edges. In this way the plates will always remain repelled and will not fly off also.

Answered by Romal Bhansali | 6th Aug, 2014, 09:39: AM

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