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Chapter 19: Q33P (page 797)

The capacitor in Figure 19.68 is initially uncharged, then the circuit is connected. Which graph in Figure 19.66 best describes the magnitude of the net electric field at location A (inside the connecting wire) as a function of time?

Short Answer

Expert verified

Figure (d) best depicts the net electric field at A.

Step by step solution

01

Given data

An uncharged capacitor is connected to a bulb and two batteries in series.

02

Charging of a capacitor

When an uncharged capacitor is connected to a battery, positive charges from the positive end of the battery flow to one plate of the capacitor and start accumulating there and negative charges from the negative end of the battery move to the other plate of the capacitor and start accumulating there.

03

Determination of the graph of the net electric field at A

As charge accumulates on the capacitor plates, the fringe field in the circuit increases. This opposes the battery field. Hence the net field decreases with time. This continues till the fringe field completely cancels out the field due to the battery. At this point the net field is zero. This is best depicted by figure (d).

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Most popular questions from this chapter

Why can birds perch on the bare wire of a power line without being electrocuted?

The capacitor in Figure 19.65 is initially charged, then the circuit is connected. Which graph in Figure 19.66 best describes the current through the bulb as a function of time?

You are marooned on a desert island full of all kinds of standard electrical apparatus including a sensitive voltmeter, but you don’t have an ammeter. Explain how you could use the voltmeter to measure currents.

A particular capacitor is initially charged. Then a high-resistance Nichrome wire is connected between the plates of the capacitor, as shown in Figure 19.69. The needle of a compass placed under the wire deflects 20°to the east as soon as the connection is made. After 60sthe compass needle no longer deflects.

(a)Which of the diagrams in Figure 19.69 best indicates the electron current at three locations in this circuit? (1) 0.01safter the circuit is connected, (2) 15s after the circuit is connected, (3) 120s after the circuit is connected.

(b)Which of the diagrams in Figure 19.70 best indicates the net electric field inside the wire at three locations in this circuit? (1) 0.01s after the circuit is connected, (2) 15safter the circuit is connected, (3) 120s after the circuit is connected.

The capacitor in Figure 19.67 is initially uncharged, then the circuit is connected. Which graph in Figure 19.66 best describes the current through the bulb as a function of time?
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