After you walk over a carpet on a dry day, your hand comes too close to a metal

Question

After you walk over a carpet on a dry day, your hand comes too close to a metal doorknob and 3.0 mm spark results. Such a spark means that there must have been a potential difference of near to 6 kV between you and the doorknob. Assuming this potential difference, how much charge did you accumulate in walking over the carpet? For this extremely rough calculation, assume that your body can be represented by a uniformly charged conducting sphere 25.0 cm in radius and electrically isolated from its surroundings. Put your answer in the form of "a.bc x 10^(x)" microcoulomb. PLEASE SHOW WORK!!!

Explanation / Answer

V = kq/r = 9*10^9 * Q/.25 = 6000

Q = 1.67 * 10^-7 C

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