Two particles of equal mass $m$ and charge $q$ are placed at a distance of $16 \, cm$. They do not experience any net force. The value of $\frac{q}{m}$ is
- AZero
- B$\sqrt{\frac{\pi \varepsilon_0}{G}}$
- C$\sqrt{\frac{G}{4\pi \varepsilon_0}}$
- D$\sqrt{4\pi \varepsilon_0 G}$
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