Two charged spheres of radii  \( \mathrm{R}_{1} \& \mathrm{R}_{2} \)  have equal s...

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Two charged spheres of radii  \( \mathrm{R}_{1} \& \mathrm{R}_{2} \)  have equal surface charge density. The ratio of their potential is
a. \( \mathrm{R}_{1} / \mathrm{R}_{2} \)
b. \( R_{2} / R_{1} \)
c. \( \left(\mathrm{R}_{1} / \mathrm{R}_{2}\right)^{2} \)
d. \( \left(R_{2} / R_{1}\right)^{2} \)
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