The quantity of charge q (in Coulombs) that has passed through a surface of area 2.00 cm? varies with tim according to the equation q = 4t3 + 5t + 6, where t is in seconds. What is the value of the current densit (in kA/m²) through the surface at t=1.00 s? Option1 Option2 Option3 Option4 Option5 85 17 25 32 58

The quantity of charge q (in Coulombs) that has passed through a surface of area 2.00 cm? varies with tim according to the equation q = 4t3 + 5t + 6, where t is in seconds. What is the value of the current densit (in kA/m²) through the surface at t=1.00 s? Option1 Option2 Option3 Option4 Option5 85 17 25 32 58

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter9: Current And Resistance

Section: Chapter Questions

Problem 86CP: Consider a square rod of material with sides of length L = 3.00 cm with a current density of...

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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?
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A particle accelerator produces a beam with a radius of 1.25 mm with a current of 2.00 mA. Each proton has a kinetic energy of 10.00 MeV. (a) What is the velocity of the protons? (b) What is the number (n) of protons per unit volume? (b) How many electrons pass a cross sectional area each second?
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Consider positive and negative charges all moving horizontally with the same speed through the four regions in Figure 17.2. Rank the magnitudes of the currents in these four regions from lowest to highest. (Ia is the current in Figure 17.2a, Ib the current in Figure 17.2b, etc.) (a) Id, Ia, Ic, Ib (b) Ia, Ic, Ib, Id (c) Ic, Ia, Id, Ib (d) Id, Ib, Ic, Ia (e) Ia, Ib, Ic, Id (f) None of these Figure 17.2 (Quick Quiz 17.1)
Consider positive and negative charges all moving horizontally with the same speed through the four regions in Figure 17.2. Rank the magnitudes of the currents in these four regions from lowest to highest. (Ia is the current in Figure 17.2a, Ib the current in Figure 17.2b, etc.) (a) Id, Ia, Ic, Ib (b) Ia, Ic, Ib, Id (c) Ic, Ia, Id, Ib (d) Id, Ib, Ic, Ia (e) Ia, Ib, Ic, Id (f) None of these Figure 17.2 (Quick Quiz 17.1)
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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?