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Chapter 18: Q13Q (page 755)

Compare the direction of the average electric field inside a battery to the direction of the electric field in the wires and resistors of a circuit.

Short Answer

Expert verified

The average electric field inside a battery and the field in the wires and resistors of the circuit are both directed from the positive terminal to the negative terminal of the battery.

Step by step solution

01

Given data

Electric field is present both inside a battery and outside in the circuit.

02

Direction of electric field

A electric field flows outwards in case of the positive charge and inwards in case of the negative charge.

03

Comparison of the electric fields outside and inside the battery

A battery has a positive terminal and negative terminal. Both inside the battery and outside, the electric field is directed from the positive terminal to the negative terminal. The electric field outside in the circuit causes the flow of charges. The electric field inside the battery doesn't cause the flow of charges.

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Most popular questions from this chapter

Suppose that a wire leads into another, thinner wire of the same material that has only a third the cross-sectional area. In the steady state, the number of electrons per second flowing through the thick wire must be equal to the number of electrons per second flowing through the thin wire. If the drift speedV1¯in the thick wire is 4×10-5ms, what is the drift speed V¯2in the thinner wire?

In the few nanoseconds before the steady state is established in a circuit consisting of a battery, copper wires, and a single bulb, is the current the same everywhere in the circuit? Explain.

Question: Some students intended to run a light bulb off two batteries in series in the usual way, but they accidentally hooked up one of the batteries backwards, as shown in Figure 18.89 (the bulb is shown as a thin filament).

(a)Use+’s and -’s to show the approximate steady-state charge distribution along the wires and bulb.

(b)Draw vectors for the electric field at the indicated locations inside the connecting wires and bulb.

(c)Compare the brightness of the bulb in this circuit with the brightness the bulb would have had if one of the batteries hadn’t been put in backwards.

(d)Try the experiment to check your analysis. Does the bulb glow about as you predicted?

A Nichrome wire 48 cm long and 0.25 mm in diameter is connected to a 1.6 V flashlight battery. What is the electric field inside the wire? Why you don’t have to know how the wire is bent? How would your answer change if the wire diameter change were 0.20 mm? (Not that the electric field in the wire is quiet small compared to the electric field near a charged tape.)

How can there be a nonzero electric field inside a wire in a circuit? Isn’t the electric field inside a metal always zero?
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