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Chapter 27: Q. 1 (page 761)

Suppose a time machine has just brought you forward from 1750(post-Newton but pre-electricity) and you've been shown the lightbulb demonstration of FIGURE Q27.1. Do observations or simple measurements you might make-measurements that must make sense to you with your 1700'sknowledge-prove that something is flowing through the wires? Or might you advance an alternative hypothesis for why the bulb is glowing? If your answer to the first question is yes, state what observations and/or measurements are relevant and the reasoning from which you can infer that something must be flowing. If not, can you offer an alternative hypothesis about why the bulb glows that could be tested?

Short Answer

Expert verified

The chemical energy must travel through the wires that connect the battery and bulb in order to become thermal energy. In other words, something must flow through these wires.

Step by step solution

01

Concept Introduction

An isolated system's total energy remains constant according to the law of conservation of energy. A change in form cannot create or destroy energy; only a transformation of form can do so.

02

Explanation

The compass needle will move when the battery is disconnected and reconnected.

The wire seems to be experiencing some problems. Then heat radiation from the light bulb has been emitted

The presence of charge at the bulb can be verified by using charged glass and plastic rods.

03

Final Answer

Consequently, even though the battery is idle, energy is transferred to the bulb somehow. The wire must carry some type of charge.

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Most popular questions from this chapter

74. FIGURE CP27.74 shows a wire that is made of two equal diameter segments with conductivities σ1and σ2. When current I passes through the wire, a thin layer of charge appears at the boundary between the segments.
a. Find an expression for the surface charge density ηon the boundary. Give your result in terms of I,σ1,σ2, and the wire's cross-section area A.
b. A 1.0-mm-diameter wire made of copper and iron segments carries a 5.0A current. How much charge accumulates at the boundary between the segments?

For what electric field strength would the current in a 2.0mmdiameter nichrome wire be the same as the current in a 1.0mmdiameter aluminum wire in which the electric field strength is0.0080V/m?

56. A hollow metal cylinder has inner radius a, outer radius b, length L, and conductivityσ. The current Iis radially outward from the inner surface to the outer surface.
a. Find an expression for the electric field strength inside the metal as a function of the radius r from the cylinder's axis.
b. Evaluate the electric field strength at the inner and outer surfaces of an iron cylinder if a=1.0cm,b=2.5cm,L=10cm,and I=25A.

The current supplied by a battery slowly decreases as the battery runs down. Suppose that the current as a function of time is I=(0.75A)e-4[6h). What is the total number of electrons transported from the positive electrode to the negative electrode by the charge escalator from the time the battery is first used until it is completely dead?

An ideal battery would produce an extraordinarily large current if "shorted" by connecting the positive and negative terminals with a short wire of very low resistance. Real batteries do not. The current of a real battery is limited by the fact that the battery itself has resistance. What is the resistance of a 9.0V battery that produces a 21A current when shorted by a wire of negligible resistance?
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