
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Using Microsoft Excel, plot a graph of Resistance on y-axis and 1/A on x-axis ], then find
the slope.
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- If we have a material with the same electrical properties in all directions, we define its resistivity p (the Greek letter "rho") as the ratio of the magnitudes of the electric field E and the current density J: 0= In vector form, The SI unit of resistivity is one-ohm meter (1 Q-m, where the Greek letter "omega" stands for "ohm"). One ohm equals one volt per ampere (1 0 = 1 VIA). For many materials and devices, Georg Simon Ohm found that J is directly proportional to E at a given temperature. If so, p is constant and we say that the material or device follows Ohm's Law or that it is ohmic. е Calculate the resistivity of a certain metal if an electric field of 7.2 x 10-3 V/m gives a current density of 1.20 x 105 A/m2 he 6.0 x 10-8 ohm-m 7.2 103 ohm-m ware O 1.2 x 105 ohm-m izo. 0.17 x 102 ohm-m icrosoft Teams Click Save and Submit to save and submit. Click Save All Answers to save all answers. Save and Submarrow_forwardFor the circuit shown in Fig. 2.45, find: (a) v, and v2, (b) the power dissipated in the 3-kN and 20-k resistors, and (c) the power supplied by the current source. 1 k2 3 ΚΩ 30 mA 5 k2 20 k2 atne nwonineri snim woled nwordzarrow_forwardThe resistivity “ρ” of a wire is expressed as ρ(x)=αx where α is a constant and x is thelength of the wire. Then calculate the ratio of R1/R2 if R1 and R2 are the resistance values ofthe wires of resistivity ρ(x)=αx. The wires have lengths 2L and 3L respectively. (Assumethat the area of the wires are the same and constant.)arrow_forward
- Find the Req of the attached circuit diagram.arrow_forwardTwo resistors connected in series have an equivalent resistance of 690 V. When they are connected in parallel, their equivalent resistance is 150 V. Find the resistance of each resistor. This problems requires the solution of a quadratic equation.arrow_forwardIn cardiovascular physiology the resistance R of a blood vessel of radius r and long L obeys the following equation R=8Ln/πr4where the Greek letter eta represents the viscosity of the blood. Suppose that a certain arteriole reduces its resistance at the rate of –1,000mmHg ∙ min. ∙ L-1 per minute elapsed. At what rate does its radius increase the instant it has a magnitude of 150μm and the resistance R of the arteriole is 3 x 106mmHg ∙ min. ∙ L-1?arrow_forward
- Find V(t) for t>=0arrow_forwardAn electron moving in a wire collides again and again with atoms and travels an average distance between collisions that is called the man free path. If the mean free path is less in some metals, what can you say about the resistance of these metals? For a given conductor, what can you do to lengthen the mean free path? [2]arrow_forwardA certain batch of copper wire was found to have a conductivity of 95.5 per cent at 20°C. What is its resistivity (a) in ohm-circular mils per foot, (6b) in microhm- centimeters?arrow_forward
- do not give copied answerarrow_forwardThe equivalent resistance of a parallel circuit having resistances 10 ohms, and 20 ohms. I already looked at the answer given. But I dont get where they got the fraction 3/20 ohms in the breakdown. This site should break down every problem as much as possible. Dont assume I know how to get to a step that the site is on.arrow_forwardA metal wire of cross-sectional area 2.00x10-6 m² and length 4.0 m has a current of 25.0 A uniformly distributed across that area. If the conductivity of the metal is, 5.9x107 (.m)-!, calculate the magnitude of the electric field, in V/m, along the wire?arrow_forward
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