A) \[1.758\times {{10}^{11}}coulomb/kg\]
B) \[1.62\times {{10}^{10}}coulomb/kg\]
C) \[9.11\times {{10}^{-21}}coulomb/kg\]
D) \[1.672\times {{10}^{27}}coulomb/kg\]
Correct Answer: A
Solution :
The value of\[\frac{e}{m}\]of an electron is given by \[\frac{e}{m}=\frac{\text{charge}\,\text{of}\,\text{electron}}{\text{mass}\,\text{of}\,\text{electron}}\] \[\left( \begin{align} & \text{Standard}\,\text{value}\,\text{of}\,\text{charge}\,\text{of} \\ & \text{electron}=1.6\times {{10}^{-19}}C \\ & \text{mass}\,\text{of}\,\text{electron}\,=9.1\times {{10}^{-31}}\,kg \\ \end{align} \right)\] \[=\frac{1.6\times {{10}^{-19}}}{9.1\times {{10}^{-31}}}\] \[=1.758\times {{10}^{11}}\,C/kg\]
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