When a piece of polythene is rubbed with wool | vedclass

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Question

(C) The charge on the polythene is $Q = -2 	imes 10^{-7} \ C$. Since the charge is negative,electrons are transferred from the wool to the polythene.

Vedclass · Accepted Answer

$11.38 	imes 10^{-19} \ kg$

Vedclass · Answer

(C) The charge on the polythene is $Q = -2 	imes 10^{-7} \ C$. Since the charge is negative,electrons are transferred from the wool to the polythene.Using the quantization of charge,$Q = ne$,where $e = 1.6 	imes 10^{-19} \ C$ is the charge of an electron.The number of electrons transferred is $n = \frac{|Q|}{e} = \frac{2 	imes 10^{-7}}{1.6 	imes 10^{-19}} = 1.25 	imes 10^{12}$.The mass of one electron is $m_e = 9.1 	imes 10^{-31} \ kg$.The total mass transferred to the polythene is $M = n 	imes m_e$.$M = (1.25 	imes 10^{12}) 	imes (9.1 	imes 10^{-31}) \ kg$.$M = 11.375 	imes 10^{-19} \ kg \approx 11.38 	imes 10^{-19} \ kg$.

When a piece of polythene is rubbed with wool,a charge of $-2 \times 10^{-7} \ C$ is developed on the polythene. What is the amount of mass transferred to the polythene?

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