A) \[\frac{a}{b}\]
B) \[\frac{b}{a}\]
C) \[\frac{{{a}^{2}}}{{{b}^{2}}}\]
D) \[\frac{{{b}^{2}}}{{{a}^{2}}}\]
Correct Answer: B
Solution :
Given electric potential of spheres are same i.e. \[{{V}_{A}}={{V}_{B}}\] Þ \[\frac{1}{4\pi {{\varepsilon }_{0}}}.\frac{{{Q}_{1}}}{a}=\]\[\frac{1}{4\pi {{\varepsilon }_{0}}}.\frac{{{Q}_{2}}}{b}\Rightarrow \]\[\frac{{{Q}_{1}}}{{{Q}_{2}}}=\frac{a}{b}\] ......(i) as surface charge density \[\sigma =\frac{Q}{4\pi {{r}^{2}}}\] Þ \[\frac{{{\sigma }_{1}}}{{{\sigma }_{2}}}=\frac{{{Q}_{1}}}{{{Q}_{2}}}\times \frac{{{b}^{2}}}{{{a}^{2}}}=\frac{a}{b}\times \frac{{{b}^{2}}}{{{a}^{2}}}=\frac{b}{a}\]
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