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College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

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College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

The switch in the circuit shown in Figure 20.29 is closed, and the lightbulb glows steadily. The inductor is a simple air-core solenoid. An iron rod is inserted into the interior of the solenoid, increasing the magnitude of the magnetic field the solenoid. As the rod is inserted, the brightness of the lightbulb (a) increases, (b) decreases, or (c) remains the same.

images

Figure 20.29 (Quick Quiz 20.6)

To determine
The brightness of the bulb.

Explanation

The brightness of the bulb depends on the potential difference across the bulb. Greater the potential difference, brighter the bulb glows.

Conclusion:

Introducing an iron rod into the solenoid increases the inductance of the coil. Therefore, the potential difference across the solenoid increases. As a result, the potential difference across the bulb decreases. Therefore, option (b) is correct.

For the brightness to increase, the potential difference across the bulb must increase...

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