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 body can discharge via sparks and shocks. Consider a human body isolated from ground, with the typical capacitance 160 pF. What charge on the body will produce a potential of 14.0 kV? mu C 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 230 mu J. To what voltage on the body does this situation correspond? kV

Explanation / Answer

C = 160 pF

(a) V = 14 kV

Q = VC = 14000*160*10^-12

Q = 2.24*10^-6 C

(b) C = 160 pF, U =230 uJ

U = 0.5*C*V^2

230*10^-6 = 0.5*160*10^-12*V^2

V = 1.7 kV

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