Small oscillations of a charge placed midway between two fixed charges

1. A.
   $\left( \frac{q^{2}}{2\pi\varepsilon_{0}{md}^{3}} \right)^{\frac{1}{2}}$
2. B.
   $\left( \frac{\pi\varepsilon_{0}md^{3}}{2q^{2}} \right)^{\frac{1}{2}}$
3. C.
   $\left( \frac{2\pi\varepsilon_{0}md^{3}}{q^{2}} \right)^{\frac{1}{2}}$
4. D.
   $\left( \frac{2q^{2}}{\pi\varepsilon_{0}md^{3}} \right)^{\frac{1}{2}}$

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1. A.
   $\sqrt{\frac{4\pi^{3}\varepsilon_{0}ma^{3}}{q_{0}Q}}$
2. B.
   $\sqrt{\frac{q_{0}Q}{4\pi^{3}\varepsilon_{0}ma^{3}}}$
3. C.
   $\sqrt{\frac{2\pi^{2}\varepsilon_{0}ma^{3}}{q_{0}Q}}$
4. D.
   $\sqrt{\frac{8\pi^{3}\varepsilon_{0}ma^{3}}{q_{0}Q}}$

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