Potential at the centre of a symmetric arrangement of equal charges

1. A.
   $\frac{q^2}{d^2}$
2. B.
   $\frac{q}{d}$
3. C.
   $\frac{d}{q}$
4. D.
   $\frac{d^2}{q^2}$

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1. A.
   $1.8\times10^{5}$ volt
2. B.
   $3.6\times10^{5}$ volt
3. C.
   $5.4\times10^{5}$ volt
4. D.
   $7.2\times10^{5}$ volt

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1. A.
   $1.5 \times 10^{5}\text{ }V$
2. B.
   $1.8 \times 10^{6}\text{ }V$
3. C.
   $2.4 \times 10^{5}\text{ }V$
4. D.
   $3.2 \times 10^{6}\text{ }V$

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1. A.
   $\dfrac{4Q}{\pi\epsilon_0r\sqrt{3}}$
2. B.
   $\dfrac{8Q}{\pi\epsilon_0r\sqrt{3}}$
3. C.
   $\dfrac{16Q}{3\pi\epsilon_0r}$
4. D.
   $\dfrac{32Q}{\pi\epsilon_0r\sqrt{3}}$

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