You are sketching equipotentials for a positively charged particle, having defined (V=0) at infinity. If you draw

Question:

You are sketching equipotentials for a positively charged particle, having defined $V=0$ at infinity. If you draw the $5.0-\mathrm{V}$ equipotential as a circle with a radius of $50 \mathrm{~mm}$, what is the radius of $(a)$ the $10-\mathrm{V}$ equipotential and (b) the 2. 0-V equipotential?

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