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A polythene piece rubbed with wool is found to have a negative charge of 3 xx 10^(-7)C. (a) Estimatethenumberofelectrons transferred (from which to which ?) (b) Is there a transfer of mass from wool to polythene ? |
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Answer» SOLUTION :When N no. of electron get TRANSFERRED from wool to polythene, it gets a negative charge, q = - Ne(Where e = magnitude of charge of one electron) `therefore N =-q/e` `=-(-3.2 xx 10^(-7))/(1.6 xx 10^(-19))` `N = 2 xx 10^(12)` Here, N no. of electrons are transferred from wool to polythene. Hence, wool loses mass of N no. of electrons and polythene gains mass of N no. of electrons. Thus, mass transferred in this process. `= Nm_(e)` `=2 xx 10^(12) xx 9.1 xx 10^(-31)` kg `=1.82 xx 10^(-18)` kg (Above mass is negligibly small) |
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