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mat-sln-asn-labq-examq

# mat-sln-asn-labq-examq - Solution for Lab Quiz 15 Conductor...

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Solution for Lab Quiz 15 Conductor in Electric Field Solution to Lab Quiz Problem 15.1(Time Constant of Human Body) Problem: Your skin resistance is about 5000Ω and your capacitance is about 100pF . What is the time constant of your body? Select One of the Following: (a) 5 × 10 12 s (b) 2 × 10 - 13 s (c) 5000s (d-Answer) 5 × 10 - 7 s (e) About 80 years with luck. Solution The time constant is τ = RC = (5000Ω)(100 × 10 - 12 F) = 5 × 10 - 7 s . Total Points for Problem: 2 Points Solution to Lab Quiz Problem 15.2(Time Constant of Quartz Sphere) Problem: The isolated conducting sphere we used in lab had radius 12 . 5cm . We insulate the sphere from ground using a tube of quartz with cross-sectional area 2cm 2 = 2 × 10 - 4 m 2 and length 40cm . The resistivity of quartz is 7 . 5 × 10 17 Ωm (good stuff huh?) Compute the time constant for the decay of this system. 1

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Select One of the Following: (a-Answer) 2 . 1 × 10 10 s (b) 1 . 3 × 10 3 s (c) 2 . 1 × 10 7 s (d) 6 . 6 × 10 10 s (e) 6 . 4 × 10 1 s Solution The resistance of the quartz rod is R = ρℓ A = (7 . 5 × 10 17 Ωm)0 . 4m 2 × 10 - 4 m 2 = 1 . 5 ×
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