Field at the centre of a uniformly charged arc or half ring

1. A.
   $\frac{3\sqrt{3}Q}{8\pi\varepsilon_{0}R^{2}}(\widehat{i})$
2. B.
   $\frac{3\sqrt{3}Q}{8\pi^{2}\varepsilon_{0}R^{2}}(\widehat{i})$
3. C.
   $\frac{3\sqrt{3}Q}{16\pi^{2}\varepsilon_{0}R^{2}}(\widehat{i})$
4. D.
   $\frac{3\sqrt{3}Q}{8\pi^{2}\varepsilon_{0}R^{2}}( - \widehat{i})$

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1. A.
   2 E
2. B.
   $\sqrt{2}E$
3. C.
   $E/2$
4. D.
   Zero

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1. A.
   2.14
2. B.
   2.44
3. C.
   3.25
4. D.
   0.7

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