Physics for Scientists and Engineers
6th Edition
ISBN: 9781429281843
Author: Tipler
Publisher: MAC HIGHER
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Chapter 25, Problem 5P
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EVALUATE THE STATEMENTS.
(1) Current density describes how charges flow through an extended object such as a wire.
(II) Current has the same value at all points in the circuit.
O lis true, Il is false.
O l is false, Il is true,
Both I and Il are true.
O Both I and II are false.
A current of 80 mA flows through a wire having a cross section of 2.0 mm The
electrical resisitivity of the wire is 4.9 x 107 2 m. Assume there are approximately
4.0 x 1021 free electrons per cubic meter in the wire.
(a)
Calculate the drift velocity (va) of electron, electron mobility (He), and
electrical field (E) produce in the wire.
(i)
(ii)
Describe the motion the electrons in the wire.
A heart defibrillator passes 12 A of current through a patient's torso for 3×10-3 s to restore
normal beating of the heart.
(a) How much charge passed through the patient's body?
(b) What voltage was used if a total energy of 300 J was dissipated by the current?
(c) Estimate the resistance of the electrical path through the person. State any
assumptions made in answering this question.
Chapter 25 Solutions
Physics for Scientists and Engineers
Ch. 25 - Prob. 1PCh. 25 - Prob. 2PCh. 25 - Prob. 3PCh. 25 - Prob. 4PCh. 25 - Prob. 5PCh. 25 - Prob. 6PCh. 25 - Prob. 7PCh. 25 - Prob. 8PCh. 25 - Prob. 9PCh. 25 - Prob. 10P
Ch. 25 - Prob. 11PCh. 25 - Prob. 12PCh. 25 - Prob. 13PCh. 25 - Prob. 14PCh. 25 - Prob. 15PCh. 25 - Prob. 16PCh. 25 - Prob. 17PCh. 25 - Prob. 18PCh. 25 - Prob. 19PCh. 25 - Prob. 20PCh. 25 - Prob. 21PCh. 25 - Prob. 22PCh. 25 - Prob. 23PCh. 25 - Prob. 24PCh. 25 - Prob. 25PCh. 25 - Prob. 26PCh. 25 - Prob. 27PCh. 25 - Prob. 28PCh. 25 - Prob. 29PCh. 25 - Prob. 30PCh. 25 - Prob. 31PCh. 25 - Prob. 32PCh. 25 - Prob. 33PCh. 25 - Prob. 34PCh. 25 - Prob. 35PCh. 25 - Prob. 36PCh. 25 - Prob. 37PCh. 25 - Prob. 38PCh. 25 - Prob. 39PCh. 25 - Prob. 40PCh. 25 - Prob. 41PCh. 25 - Prob. 42PCh. 25 - Prob. 43PCh. 25 - Prob. 44PCh. 25 - Prob. 45PCh. 25 - Prob. 46PCh. 25 - Prob. 47PCh. 25 - Prob. 48PCh. 25 - Prob. 49PCh. 25 - Prob. 50PCh. 25 - Prob. 51PCh. 25 - Prob. 52PCh. 25 - Prob. 53PCh. 25 - Prob. 54PCh. 25 - Prob. 55PCh. 25 - Prob. 56PCh. 25 - Prob. 57PCh. 25 - Prob. 58PCh. 25 - Prob. 59PCh. 25 - Prob. 60PCh. 25 - Prob. 61PCh. 25 - Prob. 62PCh. 25 - Prob. 63PCh. 25 - Prob. 64PCh. 25 - Prob. 65PCh. 25 - Prob. 66PCh. 25 - Prob. 67PCh. 25 - Prob. 68PCh. 25 - Prob. 69PCh. 25 - Prob. 70PCh. 25 - Prob. 71PCh. 25 - Prob. 72PCh. 25 - Prob. 73PCh. 25 - Prob. 74PCh. 25 - Prob. 75PCh. 25 - Prob. 76PCh. 25 - Prob. 77PCh. 25 - Prob. 78PCh. 25 - Prob. 79PCh. 25 - Prob. 80PCh. 25 - Prob. 81PCh. 25 - Prob. 82PCh. 25 - Prob. 83PCh. 25 - Prob. 84PCh. 25 - Prob. 85PCh. 25 - Prob. 86PCh. 25 - Prob. 87PCh. 25 - Prob. 88PCh. 25 - Prob. 89PCh. 25 - Prob. 90PCh. 25 - Prob. 91PCh. 25 - Prob. 92PCh. 25 - Prob. 93PCh. 25 - Prob. 94PCh. 25 - Prob. 95PCh. 25 - Prob. 96PCh. 25 - Prob. 97PCh. 25 - Prob. 98PCh. 25 - Prob. 99PCh. 25 - Prob. 100PCh. 25 - Prob. 101PCh. 25 - Prob. 102PCh. 25 - Prob. 103PCh. 25 - Prob. 104PCh. 25 - Prob. 105PCh. 25 - Prob. 106PCh. 25 - Prob. 107PCh. 25 - Prob. 108PCh. 25 - Prob. 109PCh. 25 - Prob. 110PCh. 25 - Prob. 111PCh. 25 - Prob. 112PCh. 25 - Prob. 113PCh. 25 - Prob. 114PCh. 25 - Prob. 115PCh. 25 - Prob. 116PCh. 25 - Prob. 117PCh. 25 - Prob. 118PCh. 25 - Prob. 119PCh. 25 - Prob. 120P
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- A copper wire carries a current of 82.2 mA. (a) Find the number of electrons that flow past a given point in the wire in 10.9 minutes. electrons (b) In what direction do the electrons travel with respect to the current? same direction opposite direction The magnitude is zero.arrow_forwardA copper wire carries a current of 81.2 mA. (a) Find the number of electrons that flow past a given point in the wire in 10.5 minutes. electrons (b) In what direction do the electrons travel with respect to the current? The magnitude is zero.same direction opposite directionarrow_forwardA metal wire carries a current of 77.8 mA. (a) Find the number of electrons that flow past a given point in the wire in 10.2 minutes. electrons (b) In what direction do the electrons travel with respect to the current? opposite direction The magnitude is zero. same directionarrow_forward
- A 60 W lightbulb typically has a current of 0.50 A flowing through it. Calculate (a) the number of electrons passing a cross section of the bulb’s filament each second and (b) the number that pass the section in 1 h.arrow_forwardThe human body can exhibit a wide range of resistances to current depending on the path of the current, contact area, and sweatiness of the skin. Suppose the resistance across the chest from the left hand to the right hand is 1.70 x 106 2. (a) How much voltage is required to cause possible heart fibrillation in a man, which corresponds to 480 mA of direct current? (b) Why should rubber-soled shoes and rubber gloves be worn when working around electricity?arrow_forwardAn electric flat iron draws a current of 15 A when connected to a 220 V line. (a) What is the resistance of the heating element of the flat iron assuming that it obeys Ohm’s law? What is the resistivity of the heating element if it is a wire that is 2.7 cm long with a cross-sectional area of 2.1 x 10-4 m2?arrow_forward
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