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phyprob.docx

A solid copper sphere 10 cm in diameter is deprived of 10e13(that is 10 to power of 13) electrons by charging scheme. What is charge in C on the sphere? What is the sign of the charge?

Consider a copper penny with a mass of 3.1 grams. Each copper atom has a total negative charge of -4.646x10e-18C which is the sum of the charges of individual electrons at each atom assuming the charge on the protons can be separated. (a) verify that the total electronic charge in the penny is -1.36x10e5 C. (b) frtom the total electronic charge per atom find the number of electrons per atom. Verify that this number is equal to atomic number of copper. (c) In a 100 W 110volt lightbulb the current is 0.91A. How long would it take for 1.36x10e5 C of charge to pass through this bulb? (d) At equilibrium a penny is charge neutral since the total positive nuclear charge exactly cancels out the total negative electronic charge. Suppose that we remove one electron per atom from 5% of the atoms in the penny. What is the net charge on the penny(state sign and magnitude)?

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