# A-level Physics (Advancing Physics)/Charge/Worked Solutions

**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 10 ^{23} particles) is equal to 1 faraday of charge. How many coulombs of charge are equal to 1 faraday?**

1 faraday = 6 x 10^{23} 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