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  • A polythene piece rubbed with wool is found to have a negative charge of 3 × 10^–7 C. Estimate the number of electrons transferred (from which to which?)

Q 1.11(a): A polythene piece rubbed with wool is found to have a negative charge of 3\times 10^{-7}. (a) Estimate the number of electrons transferred (from which to which?)

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Clearly, polyethene being negatively charged implies that it has an excess of electrons(which are negatively charged!). Therefore, electrons were transferred from wool to polyethene.

Given, Charge attained by polyethene = -3\times 10^{-7} C

We know, Charge on 1 electron = -1.6\times10^{-19} C

Therefore, the number of electrons transferred to attain a charge of -3\times 10^{-7} = 

\frac{-3\times 10^{-7}}{-1.6\times10^{-19} C} = 1.8\times10^{12} electrons.

 

Posted by

HARSH KANKARIA

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