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27 Mar 2009 22:28:34 IST

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how does an electron moving in its circular orbits obey coulombs law as coulombs law is only applica

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how does an electron moving in its circular orbits obey coulombs law as coulombs law is only applicable for stationary charges?

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edison

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22 Jul 2009 17:34:03 IST

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Coulomb's law is applicable for moving charges also. Thats why here the coulomb foce between electron and nucleus provides necessary centripetal force, apart from the quantisation of orbital angular momentum due to which the moving (acclerating charged particle moving in a circle) does not emit em radiation and is stable.

ronak

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22 Jul 2009 17:49:02 IST

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who says coulombs law is only for stationary charges??its For electrostatics, Coulomb's law states that the direct force F of point charge q1 on point charge q2, when the charges are separated by a distance r, is given by F = k0q1q2/r2, where k0 is a constant of proportionality whose value depends on the units used for measuring F, q, and r. It is the basic quantitative law of electrostatics. In the rationalized meter-kilogram-second (mks) system of units, k0 = 1/(4 ??0), where ?0 is called the permittivity of empty space and has the value 8.85 × 10?12 farad/m. Thus, Coulomb's law in the rationalized mks system is as in the equation below, F = \frac{1}{4\pi\epsilon_0}\frac{q_1q_2}{r^2} where q1 and q2 are expressed in coulombs, r is expressed in meters, and F is given in newtons. See also Electrical units and standards.The direction of F is along the line of centers of the point charges q1 and q2, and is one of attraction if the charges are opposite in sign and one of repulsion if the charges have the same sign. For a statement of Coulomb's law as applied to point magnet poles.Experiments have shown that the exponent of r in the equation is very accurately the number 2. Lord Rutherford's experiments, in which he scattered alpha particles by atomic nuclei, showed that the equation is valid for charged particles of nuclear dimensions down to separations of about 10?12 cm. Nuclear experiments have shown that the forces between charged particles do not obey the equation for separations smaller than this. See also Electrostatics.

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