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

n = \frac{5}{1.6 \times 10^{-19}} = 31.25 \times 10^{18}\mbox{ electrons}

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