COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 18, Problem 17QAP
To determine
The resistance relationship of the copper wire when they are compared to one that has the small diameter to the one that has the larger diameter.
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7. . Consider a resistor network connected to a 32.0-V battery as shown. The
battery has negligible internal resistance. If the equivalent resistance of the resistor network is
6.40 Q, what is the value of the resistance of one of the resistors?
c) 2.50 2
d) 1.10 Q
a) 0.562 Q
E = 32.0 V
b) 5.50 Q
2.00 N
2.00 N
1.50 N
3.00 N
3.00 N
8. . From the circuit network in Item 7, what is the potential difference across
the resistor ?
c) 5.00 V
d) 12.5 V
a) 4.50 V
b) 7.50 V
When the cross-sectional area of a conducting wire is doubled while its length is cut in half, the resistance of the wire will be __________ .
a.
three time sits original value.
b.
one-third of its original value.
c.
the same as before.
d.
one-fourth of its original value.
e.
four times its original value.
24. Consider a battery that has potential difference V₁ =
1.5 V across its terminals when it is not connected to a
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2.62, the potential difference between the two terminals
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R₁
Fig. 2
B
Chapter 18 Solutions
COLLEGE PHYSICS
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- When a straight wire is heated, its resistance changes according to the equation R = R0 [1 + (T T0)] (Eq. 17.7), where is the temperature coefficient of resistivity. (a) Show that a more precise result, which includes the length and area of a wire change when it is heated, is R=R0[1+(TT0)][1+(TT0)][1+2(TT0)] where is the coefficient of linear expansion. (See Topic 10.) (b) Compare the two results for a 2.00-m-long copper wire of radius 0.100 mm, starting at 20.0C and heated to 100.0C.arrow_forwardWhen a straight wire is heated, its resistance changes according to the equation R = R0 [1 + (T T0)] (Eq. 17.7), where is the temperature coefficient of resistivity. (a) Show that a more precise result, which includes the length and area of a wire change when it is heated, is R=R0[1+(TT0)][1+(TT0)][1+2(TT0)] where is the coefficient of linear expansion. (See Topic 10.) (b) Compare the two results for a 2.00-m-long copper wire of radius 0.100 mm, starting at 20.0C and heated to 100.0C.arrow_forwardTwo conducting wires A and B of the same length and radius are connected across the same potential difference. Conductor A has twice the resistivity of conductor B. What is the ratio of the power delivered to A to the power delivered to B? (a) 2 (b) 2 (c) 1 (d) 12 (e)12arrow_forward
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- A uniform conductor of length Į and cross-sectional area A. When the cross-sectional area decreases, its resistance O a. increases O b. decreases O. remains constant d. may increase or decreasearrow_forward2. Find the current through and potential difference across each resistor shown in the figure. [Answer: for R₁ 25 N, R₂ I₁ = I₁ = 0.14 A and I₂ = - 15 Ω, R3 I3 = 0.070 A] = = 8.0 V 25 Q2 www ww 25 Q2 15 Q2 15 Q2 15 N, and R4 = 25 №2, AV₁ = AV₁ = 3.5 V and AV23 = 1.0 V;arrow_forwardA certain wire has resistance R. Another wire of the same material has half the length and half the diameter of the first wire. The resistance of the second wire is: a) R/4 b) R/2 c) 2R d) 4R e) Rarrow_forward
- 18. A human being can be electrocuted if a current as small as 50 mA passes near the heart. An electrician working with sweaty hands makes good contact with two conductors being held one in each hand. If the electrician's resistance is 1800 2, what might the fatal voltage be?arrow_forward1. One of these circuits has an equivalent resistance that is not like the others. Which one doesn't belong? Circle the one that doesn't belong. 16 2 '16 Ω 8 2 8Ω 8 2 2. One of these circuits has an equivalent resistance that is not like the others. Which one doesn't belong? Circle the one that doesn't belong. 4Ω 4 2 8 2 8 2 2Ωarrow_forward6. An electrical circuit is shown below. The battery supplies 15 V. The resistances have the following values: R₁= 30 Ω, R₂ = 40 Ω, R3 = 20 Ω . (a) Calculate the replacement resistance of the three resistors. (b) Calculate the total current through the circuit, and the current through the respective resistor (c) If the lower right corner is grounded, then calculate the potentials at points A and B. (d) If the current is interrupted at point C, what will be the potentials at A and B.arrow_forward
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