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Question
Exercise.
Rubbing a comb on hair makes the comb get – 0.4C.
- Find which material has lost electron and which one gained it.
- Find how many electrons are transferred in this process.
Solution
-
The material is comb which gained electrons and the hair gained it.
-
Charge on 1 electron, e = 1.6 × 10– 19C
q = ne or n = `q/e`
n = `0.4/1.6` × 10– 19 = 0.25 × 1019 = 2.5 × 1018
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