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On a dry day, a person can become electrically charged by rubbing against rugs and other ordinary objects. Suppose you notice a small shock as you reach for a metal doorknob, noting that the shock occurs along with a tiny spark when your hand is about 3.0 mm from the doorknob. As a rough estimate, use Eq. 23–4b to estimate the potential difference between your hand and the doorknob. (a) 9 V; (b) 90 V; (c) 900 V; (d) 9000 V; (e) none of these.
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