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A polythene piece rubbed will wool is fo...

A polythene piece rubbed will wool is found to have a negative charge of `3.0xx10^(-7)C`.
(a) Estimate the number of electrons transferred (from which to which )?
(b) Is there a transfer of mass from wool to polythene?

Text Solution

Verified by Experts

Here, `q = -3xx10^(-7)C`, Charge on one electron, `e = -1.6xx10^(-19) C`
`:.` Number of electrons transferred to polythene piece from wool, `n = (q)/(e) = (-3xx10^(-7))/(-1.6xx10^(-19)) = 1.875xx10^(12)`
(b) Yes, there is a transfer of mass from wool to polythene piece.
As mass of each electron `= 9xx10^(-31) kg`
`:.` Mass transferred to polythene `= 1.875xx10^(12)xx9xx10^(-31) kg = 1.687xx10^(-18) kg`.
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