1.11 A polythene piece rubbed with wool is found to have a negative charge of 3 C.
(a) Estimate the number of electrons transferred (from which to which?)
(b) Is there a transfer of mass from wool to polythene?
1.11 A polythene piece rubbed with wool is found to have a negative charge of 3 C.
(a) Estimate the number of electrons transferred (from which to which?)
(b) Is there a transfer of mass from wool to polythene?
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1 Answer
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1.11
(a) When polythene rubbed against wool, a number of electrons get transferred from wool to polythene. Hence, wool becomes positively charged and polythene negatively charged.
Amount of charge on the polythene piece, q = -3 C.
Amount of charge of 1 electron e = -1.6
So number of electron transferred from wool to polythene
=
-1.875(b) Since electron has a mass, so there will be transfer of mass also.
Mass of single electron, = 9.1 kg
Total mass transferred from wool to polythene = 1.875 9.1 kg
= 1.706 kg negligible
Hence a negligible amount of mass is transferred from wool to polythene.
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