On Dry Winter Day You Scuff Your Leather

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 dark room 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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