Physics Notes

# Physics Notes - SI unit for charge is coulomb C E =-1.6 x...

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SI unit for charge is coulomb ( C ) E = -1.6 x 10^-19 C P = 1.6 x 10^-19 C How much charge in 1 g of iron? Iron – 26 protons, 26 electrons, 30 neutrons. Mass of an atom of iron is (30+26) x mass = 56 x 10^-27kg = 9.52 x 10^-26 = mass = 10^-22 g 1 gram must have 10^22 atoms – each atom w/ 26 protons or elections therefore the charges are 26 x 10^22 x 1.6 x 10^-19 = 41.6 x 10^3 C Coulomb’s Law- the law quantifying the force acting btw 2 charges is similar to the one w/ gravitational forces. F = k [q1q2] R^2 K = 8.988 x 10^9 N* m^2 / C^2 Direcetion of force depends on the relative sign of the charges. Iron- 41600 C 2 protons at a distance r from eachother (9x10^9 * (1.6x10^-19 * 1.6 x10^-19)) / r^2 Gravity is 1 billion, billion, billion, billion times weaker than electricity! Electric Field Start w/ empty space Than insert a charge somewhere This charge creates an affect around the space surrounding it. If another charge is present somewhere in space, it will feel a force due to the first charge. This is called an electric field. Given a certain charge distribution, we want to be able to characterize the forces generated bys cuh charges in an absouluted way. Operational definition of electric field due to a given charge distribution: 1) position at P an arbitrary positive test charge q0 2) measure the electric force F felt by q0

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3) divide the F by q): this is the value of the field E= F/q0 Units of electric field : N/C Electric field genereated by a point charge:
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