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Q.

A polythene piece rubbed with wool is found to have negative charge of 3.6 × 10-7 C. If an electron has a mass 9.1×10-31 kg, find the mass transferred to polythene

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a

2.25×1010kg

b

6.25×10−18kg

c

4.15×10−18kg

d

2.05×10−18kg

answer is C.

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Detailed Solution

n=qe=3.6×10−7C1.6×10−19C=2.25×1012Therefore,  mass  transferred  from  wool  to  polythene,M=n×me=2.25×1012×9.1×10−31=2.05×10−18kg

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