As a person moves about in a dry environment, electric charge accumulates on the

Question

As a person moves about in a dry environment, electric charge accumulates on the person?s body. Once it is at high voltage, either positive or negative, the T body can discharge via sparks and shocks. Consider a human body isolated from ground, with the typical capacitance 150 pF. (a) What charge on the body will produce a potential of 10.0 kV? (b) Sensitive electronic devices can be destroyed by electrostatic discharge from a person. A particular device can be destroyed by a discharge releasing an energy of 250 mu J. To what volt age on the body does this situation correspond?

Explanation / Answer

the relatiion between Charge, Potnetial V and Capacitance C is given by

Q = CV

part A:

Charge Q = 150 e-12 * 10 e 3

Q = 1.5 uC ------------<<<<<<<<<<<<<<<<<<<Answer

--------------------------------

apppy energy across the capaciatnce C = 0.5CV^2

so

V^2 = 2U/C

V^2 = (2* 250 e-6)/(150 e-12)

V^2 = 3.334 e 6 Volts

V = 1.82 kVolts ------------<<<<<<<<<<<<<<<<<<<Answer

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