<|system|>
A charged particle produces an electric field with a magnitude of $2.0 \mathrm{~N} / \mathrm{C}$ at a point that is $50 \mathrm{~cm}$ away from the particle. What is the magnitude of the particle's charge?
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<|user|>
Can you answer based on context?
<|assistant|>
$ 56 \mathrm{pC}$