Potential at the centre of a charged semicircular arc or half rings

1. A.
   $\frac{2\lambda}{\varepsilon_0}$
2. B.
   $\frac{\lambda}{2\varepsilon_0}$
3. C.
   $\frac{\lambda}{4\varepsilon_0}$
4. D.
   $\frac{\lambda}{\varepsilon_0}$

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1. A.
   $2\lambda/\epsilon_0$
2. B.
   $\lambda/2\epsilon_0$
3. C.
   $\lambda/4\epsilon_0$
4. D.
   $\lambda/\epsilon_0$

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1. A.
   $\dfrac{\lambda}{4\varepsilon_0}$
2. B.
   $\dfrac{\lambda}{2\varepsilon_0}$
3. C.
   $\dfrac{\lambda}{8\varepsilon_0}$
4. D.
   $\dfrac{\lambda}{\varepsilon_0}$

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