Questions Ch 21 Electric Charge and Electric Fields

Questions Ch 21 Electric Charge and Electric Fields - Q...

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Unformatted text preview: Q 21.1 Excess electrons are placed on a small lead sphere with mass 8.00g so that its net charge is -3.20 x 10-9 C. a) Find the number of excess electrons on the sphere. b) How many excess electrons are there per lead atom? The atomic number of lead is 82 and its atomic mass is 207 g/mol Lead Ore a ) The number of excess electrons needed to produce net charge q is: b ) Use the atomic mass of lead to find the number of lead atoms in 8.00 x 10-3 kg of lead. From this and the total number of excess electrons, find the number of excess electrons per lead atom. The atomic mass of lead is 207 x 10-3 kg/mole , so the number of moles in 8.00 x 10-3 kg is: Avogadros number N A is the number of atoms in 1 mole, so the number of lead atoms is: The number of excess electrons per lead atom is: Exercise 21.24 Two charges , one of 2.50 C and the other of -3.50 C , are placed on the x-axis; one at the origin as shown, and the other at x = 0.600 m ....
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Questions Ch 21 Electric Charge and Electric Fields - Q...

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