Blackboard →XC A 118 minutes remaining Recording You can't make a new submission attempt after due date. 19 OF 19 QUESTIONS REMAINING ☑ Time limit Three currents are passing through a surface bounded by a closed path. The currents have different values and directions. According to Ampere's law, EB,Al Hol, what is the value of / on the right side of this equation? = A) 2A B +4 A C) OA -4A Questions Filter (19) 4=-3A 12=+4 A ... 4--5A 120 minutes | Automatic submission Attempts 1 attempt left E Assessment security Respondus LockDown Browser Grading Maximum points 100.3 points I Extra Credit K First < Previous Next > Last > AR 11.8 points Additional Information Refresh the assessment to view updated details after you submit an attempt. Submit

Blackboard →XC A 118 minutes remaining Recording You can't make a new submission attempt after due date. 19 OF 19 QUESTIONS REMAINING ☑ Time limit Three currents are passing through a surface bounded by a closed path. The currents have different values and directions. According to Ampere's law, EB,Al Hol, what is the value of / on the right side of this equation? = A) 2A B +4 A C) OA -4A Questions Filter (19) 4=-3A 12=+4 A ... 4--5A 120 minutes | Automatic submission Attempts 1 attempt left E Assessment security Respondus LockDown Browser Grading Maximum points 100.3 points I Extra Credit K First < Previous Next > Last > AR 11.8 points Additional Information Refresh the assessment to view updated details after you submit an attempt. Submit

College Physics

10th Edition

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter17: Current And Resistance

Section: Chapter Questions

Problem 22P: The human body can exhibit a wide range of resistances to current depending on the path of the...

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The 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 1.0 106 . (a) How much voltage is required to cause possible heart fibrillation in a man, which corresponds to 500 mA of direct current? (b) Why should rubber-soled shoes and rubber gloves be worn when working around electricity?
Draw a sketch of the situation in Figure 22.30 showing the direction of electrons carrying the current, and use RHR-l to verify the direction of the force on the wire.
A large cyclotron directs a beam of He ++ nuclei onto a target with a beam current of 0.250 mA. (a) How many He++ nuclei per second is this? (b) How long does it take for 1.00 C to strike the target? (c) How long before 1.00 mol of He++ nuclei strike the target?
Integrated Concepts (a) What energy is dissipated by a lightning bolt having a 20,000-A current, a voltage of 1.00102 MV, and a length of 1.00 ms? (b) What mass of tree sap could be raised from 18.0°C to its boiling point and then evaporated by this energy, assuming sap has the same thermal characteristics as water?
. The generator at a large power plant has an output of 1,000,000 kW at 24,000 V. (a) If it were a DC generator, what would he the current in it? (b) What is its energy output each day—in joules and in kilowatt—hours? (c) If this energy is sold at a price of 10 cents per kilowatt-hour, how much revenue does the power plant generate each day?
If two different wires having identical cross-sectional areas carry the same current, will the drift velocity be higher or lower in the better conductor? Explain in terms of the equation vd=1nqA by considering how the density of charge carriers n srelates to whether or not a material is a good conductor.
Integrated Concepts (a) An aluminum power transmission line has a resistance of 0.0580/km. What is its mass per kilometer? (b) What is the mass per kilometer of a copper line having the same resistance? A lower resistance would shorten the heating time. Discuss the practical limits to speeding the heating by lowering the resistance.
A Van de Graaff generator is one of the original particle accelerators and can be used to accelerate charged particles like protons or electrons. You may have seen it used to make human hair stand on end or produce large sparks. One application of the Van de Graaff generator is to create X-rays by bombarding a hard metal target with the beam. Consider a beam of protons at 1.00 keV and a current of 5.00 mA produced by the generator, (a) What is the speed of the protons? (b) How many protons are produced each second?
A 20.00-V battery is used to supply current to a 10-k resistor. Assume the voltage drop across any wires used for connections is negligible, (a) What is the current through the resistor? (b) What is the power dissipated by the resistor? (c) What is the power input from the battery; assuming all the electrical power is dissipated by the resistor? (d) What happens to the energy dissipated by the resistor?
In Figure 21.41. does the graph indicate the time constant is shorter for discharging than for charging? Would you expect ionized gas to have low resistance? How would you adjust R to get a longer time between flashes? Would adjusting R affect the discharge time?
Can all of die currents going into the junction shown below be positive? Explain.
A young man owns a canister vacuum cleaner marked 535 W [at] 120 V and a Volkswagen Beetle, which he wishes to clean. He parks the car in his apartment parking lot and uses an inexpensive extension cord 15.0 m long to plug in the vacuum cleaner. You may assume the cleaner has constant resistance, (a) If the resistance of each of the two conductors in the extension cord is 0.900 , what is the actual power delivered to the cleaner? (b) If instead the power is to be at least 525 W, what must be the diameter of each of two identical copper conductors in the cord he buys? (c) Repeat part (b) assuming the power is to be at least 532 W.