iPad T 21%E 10:09 PM session masteringphysics.com Co Pearson\'s My Lab & Masteri

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iPad T 21%E 10:09 PM session masteringphysics.com Co Pearson's My Lab & Mastering PHY2 Mastering Physics: Problem Set 4 Mastering Physics: Assignments PHY 2054 001 FAMU TERM-C SUMM2016 9,72 12 of 22 meat Problem 19.72 suppose that aperson's body resistance is 980 f2 (moist skin). Part A What current passes through the body when the person accidentally is connected to 120 V? Express your answer to two significant figures and include the appropriate units. I. 0.122 A MY,Answers Correct Part B there is an alternative path to ground whose resistance is 30 n.what current passes through the person? Express your answer to two significant figures and include the appropriate units. 8160 mA Submit My Answers Give Up Incorrect: Try Again: 4 attempts remaining Part C rthe voltage source can produce at most 1A A. how much current passes through the person in the prevous case? Express your answer to two significant figures and include the appropriate units. Value Units Submit My Answers give up Continue

Explanation / Answer

B.

Now the ground and person will form a parallel circuit

1/Rp = 1/R1 + 1/R2

Rp = (1/980 + 1/30)^-1

Rp = 29.11 ohm

V = 120 V

ohm's law:

V = i*R

i = V/R = 120/29.11

ieq = 4.12 Amp.

current through person's body will be

ib = ieq*Rg/(Rg + Rb)

ib = 4.12*30/(30 + 980)

ib = 0.122 Amp.

C.

imax = 1.4 Amp

ib = 1max*Rg/(Rb + Rg)

ib = 1.4*30/(30 + 980)

ib = 0.0416 Amp.

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