Potential at the centre of concentric charged spheres

1. A.
   $\frac{\sigma}{\varepsilon_{0}}(a + b + c)$
2. B.
   $\frac{\sigma}{\varepsilon_{0}}( - a + b - c)$
3. C.
   $\frac{\sigma}{\varepsilon_{0}}(a - b + c)$
4. D.
   $\frac{\sigma}{3\varepsilon_{0}}(a + b + c)$

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1. A.
   $\dfrac{\sigma(R + r)}{\epsilon_0}$
2. B.
   $\dfrac{\sigma(R - r)}{\epsilon_0}$
3. C.
   $\dfrac{\sigma(R + r)}{2\epsilon_0}$
4. D.
   $\dfrac{\sigma(R + r)}{4\epsilon_0}$

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