$A$ charged particle of mass $0.003 \, g$ is held stationary in space by placing it in a downward electric field of $6 \times 10^4 \, N/C$. The magnitude of the charge is:
- A$5 \times 10^{-4} \, C$
- B$5 \times 10^{-10} \, C$
- C$-18 \times 10^{-6} \, C$
- D$-5 \times 10^{-9} \, C$
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