PHYSICS F/SCI.+ENGINEERS W/MOD.PHYSICS
5th Edition
ISBN: 9780321992277
Author: GIANCOLI
Publisher: PEARSON
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-37 In Fig. 27-48, the resistances
are R, = 2.00 N, R, = 5.00 N, and the
battery is ideal. What value of R3
Ra
R3
maximizes the dissipation rate in
resistance 3?
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During an experiment to verify Ohm's law, the voltage supplied and the current through a circuit are measured.
[Voltage is measured in Volt (V) and current in Ampere (A)].
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R
on
Battery
The measured value of the current is I = 3.1 ± 0.2 A and that of the voltage is V = 14 0.5 V. The resistance of
the circuit (in N) can be calculated using the formula, R = V/I,
Calculate the,
a) Resistance (in 2) =
b) Fractional uncertainty in the resistance =
c) Absolute uncertainty (in 2) in the resistance=
(9) THE FOLLOWING QUESTIONS ARE BASED ON THE INFORMATION GIVEN HERE.
A rod of semiconducting material of length L = 3 m and cross-sectional area A = 4.5 mm² lies along the x-axis between x = 0 and x = L. The material obeys Ohm's law, and its
(1-#)
resistivity varies along the rod according to p = po
where po
= 5 x 10-4 SN · m. The end of the rod at x = 0 is at a potential Vo
10 V greater than the end at x = L.
L²
A) What is the total resistance, in units of 2, of the rod?
Answer:
B) What is the current, in units of miliamperes, in the rod?
Answer:
C) What is the electric potential, in units of Volt, in the rod at x = L/2?
Answer:
D) What is the electric-field magnitude E, in units of V/m, in the rod at x = L/2?
Answer:
Chapter 25 Solutions
PHYSICS F/SCI.+ENGINEERS W/MOD.PHYSICS
Ch. 25.2 - If 1 million electrons per second pass a point in...Ch. 25.2 - Prob. 1BECh. 25.3 - Return to the Chapter-Opening Question, page 651,...Ch. 25.4 - Prob. 1DECh. 25.4 - Prob. 1EECh. 25.4 - Prob. 1FECh. 25.4 - How many 60-W 120-V lightbulbs can operate on a...Ch. 25.6 - Each channel of a stereo receiver is capable of an...Ch. 25 - What quantity is measured by a battery rating...Ch. 25 - When an electric cell is connected to a circuit,...
Ch. 25 - When a flashlight is operated, what is being used...Ch. 25 - One terminal of a car battery is said to be...Ch. 25 - When you turn on a water faucet, the water usually...Ch. 25 - Can a copper wire and an aluminum wire of the same...Ch. 25 - The equation P = V2/R indicates that the power...Ch. 25 - What happens when a lightbulb burns out?Ch. 25 - If the resistance of a small immersion heater (to...Ch. 25 - Prob. 10QCh. 25 - Explain why lightbulbs almost always burn out just...Ch. 25 - Which draws more current, a 100-W lightbulb or a...Ch. 25 - Electric power is transferred over large distances...Ch. 25 - A 15-A fuse blows repeatedly. Why is it dangerous...Ch. 25 - When electric lights are operated on low-frequency...Ch. 25 - Driven by ac power, the same electrons pass back...Ch. 25 - The heating element in a toaster is made of...Ch. 25 - Is current used up in a resistor? Explain.Ch. 25 - Compare the drift velocities and electric currents...Ch. 25 - A voltage V is connected across a wire of length l...Ch. 25 - Why is it more dangerous to turn on an electric...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. 10PCh. 25 - Prob. 11PCh. 25 - Prob. 12PCh. 25 - Prob. 13PCh. 25 - Prob. 14PCh. 25 - Prob. 15PCh. 25 - (II) A rectangular solid made of carbon has sides...Ch. 25 - (III) A hollow cylindrical resistor with inner...Ch. 25 - Prob. 63GP
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- (b) 50 2 shown in the Figure Q11(b). Find the equivalent resistance across AB. (i) (ii) Find the voltage VAB across AB. 15v Vs Rs R2 A B R1 R3 R1 = 20 92, R2 = 30 2 and R3 = + VABarrow_forward(i) A battery has an emf of 3.0 V and an internal resistance of 0.0200 Ω. What is the terminal voltage when the current drawn from the battery is 2.0 A? The terminal voltage is = (ii) If a current of 75 mA exists in a metal wire, how many electrons flow past a given cross section of the wire in 3 min? Number of electrons flow past a given cross section of the wire =arrow_forwardWhat are the readings of the voltmeters and ammeters in the picture? Assume two significant digits in resistance values.arrow_forward
- (II) Two aluminum wires have the same resistance. If one hastwice the length of the other, what is the ratio of the diameterof the longer wire to the diameter of the shorter wire?arrow_forwardTwo resistors, one having a resistance of 840 kn, are connected in series to produce a total resistance of 0.430 MQ. (a) What is the value of the second resistance (in ko)? ΚΩ (b) What is unreasonable about this result? (c) Which assumptions are unreasonable or inconsistent? liarrow_forward(ii) What will be the value of the voltage drop across the R3 = 80 resistor?| R1 50 R2 100 V 30 V R3 80arrow_forward
- (c) Find the resistance per unit length of a gold wire with radius of 0.025 m. Given the resistivity,p of gold is 2.44 x 10° 2.m.arrow_forward(F) Two copper cylinder are connected to identical (ideal) batteries. Both cylinders are the same length, but one of the cylinders is thinner than the other (i.e. one has a smaller cross-sectional area). Which of the two has the smaller resistance: (i) thicker cylinder (iv) unable to determine (ii) thiner cylinder (iii) both have the same resistance (G)Two copper cylinder are connected to identical (ideal) batteries. Both cylinders are the same length, but one of the Which of the two has the smaller current:arrow_forward(a) Suppose two resistors are connected in parallel with resistances Rị and R2 measured in Ohms (N). The total resistance R is given by 1 1 1 R R1 R2 Suppose R1 is increasing at a rate of 1/4 2/s and R2 is increasing at a rate of 1/16 N/s. At what rate is R changing when R1 = 1/2 N and R2 = 1/4 N. (b) Car A is traveling North at a rate of 60 mi/hr, car B is traveling West at a rate of 45 mi/hr. The cars are on straight roads approaching an intersection point. At what rate is the distance between the cars changing when Car A is 3 miles from the intersection and Car B is 4 miles from the intersection.arrow_forward
- 103 In Fig. 27-83, E, = 6.00 V, E, = 12.0 V, R, = 200 N, and R, = 100 N. %3! %3D R. What are the (a) size and (b) direction (up or down) of the current through resistance 1, the (c) size and (d) direc- tion of the current through resistance 2, and the (e) size and (f) direction of the current through battery 2? Figure 27-83 Problem 103.arrow_forward(II) A 100-W lightbulb has a resistance of about 12 Q when cold (20°C) and 140 N when on (hot). Estimate the tem- perature of the filament when hot assuming an average temperature coefficient of resistivity a = 0.0045 (C°)-1.arrow_forward(b) 1. A platinum resistance sensor has a resistance of 100 2 at 0 °C and a temperature coefficient of resistance (oc) of 4 x 10 "C. If the resistance of the sensor is 125 O, find the corresponding temperature of the sensor. ii. A variable dielectric capacitive displacement sensor consists of two square metal plates of side 5 cm, separated by a gap of 1 mm. A sheet of dielectric material 1 mm thick and of the same area as the plates can be slide between them as shown in Figure Q.4b. Given that the dielectric constant of air is 1 and that of the dielectric material is 4, calculate the capacitance of the sensor when the input displacement x-0.0 cm, 2.5 cm and 5,0 cm. Figure Q4barrow_forward
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Ohm's law Explained; Author: ALL ABOUT ELECTRONICS;https://www.youtube.com/watch?v=PV8CMZZKrB4;License: Standard YouTube License, CC-BY