A) \[260\,volt/cm\]
B) \[260\,newton/coulomb\]
C) \[130\,volt/cm\]
D) \[130\,newton/coulomb\] \[(g=10\,newton/kg,\,e=1.6\times {{10}^{-19}}coulomb)\]
Correct Answer: B
Solution :
For balance \[mg=eE\] Þ \[E=\frac{mg}{e}\] Also \[m=\frac{4}{3}\pi \,{{r}^{3}}d=\frac{4}{3}\times \frac{22}{7}\times {{({{10}^{-7}})}^{3}}\times 1000\,kg\] Þ \[E=\frac{4/3\times 22/7\times {{({{10}^{-7}})}^{3}}\times 1000\times 10}{1.6\times {{10}^{-19}}}\]= 260 N/C
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