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

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a

$2 .25 \times 10^{10} kg$

b

$6 .25 \times 10^{- 18} kg$

c

$2 .05 \times 10^{- 18} kg$

d

$4 .15 \times 10^{- 18} kg$

answer is C.

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Detailed Solution

$\begin{array}{l} n = \frac{q}{e} = \frac{3 .6 \times 10^{- 7} C}{1 .6 \times 10^{- 19} C} = 2 .25 \times 10^{12} \\ Therefore, mass transferred from wool to polythene, \\ M = n \times m_{e} = 2 .25 \times 10^{12} \times 9 .1 \times 10^{- 31} \\ = 2 .05 \times 10^{- 18} kg \end{array}$

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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