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A-level Physics (Advancing Physics)/Charge/Worked Solutions
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1. How much charge do 1234 electrons carry?
1234 x 1.6 x 10−19 = 1.9744 x 10−16 C = 197.44 aC (attocoulombs)
2. How many electrons does is take to carry 5 C of charge?
5 = 1.6 x 10−19 x n
3. The total charge on 1 mole of electrons (6 x 1023 particles) is equal to 1 faraday of charge. How many coulombs of charge are equal to 1 faraday?
1 faraday = 6 x 1023 x 1.6 x 10−19 coulombs = 96000 coulombs =96kC
4. The mass of a ball is 50 mg. It is supplied 5C of charge. Will there be any change in the mass of the ball? If so, calculate the change of the mass.
5 = 1.6 x 10−19 x n