A) \[1.28\times {{10}^{5}}\,N/C\]
B) \[1.28\times {{10}^{6}}\,N/C\]
C) \[1.28\times {{10}^{7}}\,N/C\]
D) \[1.28\times {{10}^{4}}\,N/C\]
Correct Answer: A
Solution :
| [a] Electric field outside a conducting sphere |
| \[E=\frac{1}{4\pi {{\in }_{0}}}\frac{Q}{{{r}^{2}}}\] |
| \[=\frac{9\times {{10}^{9}}\times 3.2\times {{10}^{-7}}}{225\times {{10}^{-4}}}\] |
| \[=0.128\times {{10}^{6}}\] |
| \[=1.28\times {{10}^{-5}}N/C\] |
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