Halliday-cap 22-vol.3- Rar - P22 019

Transcript

19. The mass of an electron is m = 9.11 × 10−31 kg, so the number of electrons in a collection with total mass M = 75.0 kg is 75.0 kg M = = 8.23 × 1031 electrons . N= m 9.11 × 10−31 kg The total charge of the collection is q = −N e = −(8.23 × 1031 )(1.60 × 10−19 C) = −1.32 × 1013 C .