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Potential Due to System of Charges

Question

On a dry winter day, you scuff your leather-soled shoes across a carpet and get a shock when you extend the tip of one finger toward a metal doorknob. In a darkroom, you see a spark perhaps $$5 \,mm$$ long. Make order of-magnitude estimates of
(a) your electric potential and
(b) the charge on your body before you touch the doorknob. Explain your reasoning.

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On a dry winter day, you scuff your leather-soled shoes across a carpet and get a shock when you extend the tip of one finger toward a metal doorknob. In a darkroom, you see a spark perhaps $$5 \,mm$$ long. Make order of-magnitude estimates of
(a) your electric potential and
(b) the charge on your body before you touch the doorknob. Explain your reasoning.

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