Electric field on the surface of a uniformly charged solid sphere

1. A.
   $\dfrac{\rho r}{3\epsilon_0}$
2. B.
   $\dfrac{\rho}{4\pi\epsilon_0 r}$
3. C.
   zero
4. D.
   $\dfrac{5\rho r}{6\epsilon_0}$

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1. A.
   zero
2. B.
   $\frac{5\sigma r}{6\varepsilon_{0}}$
3. C.
   $\frac{1}{4\pi\varepsilon_{0}}\frac{\sigma}{r}$
4. D.
   $\frac{\sigma r}{3\varepsilon_{0}}$

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