1.)The Bohr model of the hydrogen atom proposes that the elctron orbits aroud th

Question

1.)The Bohr model of the hydrogen atom proposes that the elctron orbits aroud the proton in a circle of radius 5.3*10^-11m. the electric force is responsible for the radial acceleration of the electron. What is the speed of the electron in this model?

2.)A parallel-plate capacitor consists of two flat metal plates of area A seperated by a small distance d. the plates are given equal and opposit net charges (+,-)q. (a)sketch the field lines and use your sketch to explain why almost all the charge is on the iinner surfaces of the plates. (b)Use Gauss's law to show that the electric field between the plates and away from the edges is E=q/(e0 A)=sigma/e0.

Explanation / Answer

ans 1) In this model there are two forces involved in the process: centripetal and electric force (gravitational force is neglected because it is minimal relative to the other forces). So using Newton's 2nd: F=ma (m=mass of electron; this model assumes that the proton is fixed and only the electron moves) v=2184460.08 m/s Ans 2 ) Because the first plate has some number of excess + charges and the second has the identical number of excess negative charges, all the E-field (lines) will start on the positives and end on the negatives. There won't be any E-field in the material, so no potential difference.

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