A) \[0\centerdot 75\,C\]
B) \[7\centerdot 5\,C\]
C) \[75\,C\]
D) zero
Correct Answer: A
Solution :
\[r=25\,cm\,=0\,.\,25\,m,\,\sigma =\frac{3}{\pi }C/{{m}^{2}}\]. As, \[\sigma =\frac{q}{4\pi {{r}^{2}}}\] \[\Rightarrow q=4\pi \times {{\left( 0.25 \right)}^{2}}\times \frac{3}{\pi }\] \[=0.75\,C\]
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