Q 1.11(b): A polythene piece rubbed with wool is found to have a negative charge of 3\times 10^{-7}C. Is there a transfer of mass from wool to polythene?

Answers (1)

The charge attained by polyethene (and also wool!) is solely due to the transfer of free electrons.

We know, Mass of an electron = 9.1\times10^{-31}\ kg

 The total mass of electron transferred = Number of electrons transferred x Mass of an electron

=  9.1\times10^{-31} \times 1.8\times10^{12}\ kg = 16.4\times10^{-19} \ kg

Yes, there is a transfer of mass but negligible.

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