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A parallel-plate capacitor with only air between the

Chapter 24, Problem 65P

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QUESTION:

A parallel-plate capacitor with only air between the plates is charged by connecting it to a battery. The capacitor is then disconnected from the battery, without any of the charge leaving the plates. (a) A voltmeter reads 45.0 V when placed across the capacitor. When a dielectric is inserted between the plates, completely filling the space, the voltmeter reads 11.5 V. What is the dielectric constant of this material? (b) What will the voltmeter read if the dielectric is now pulled partway out so it fills only one-third of the space between the plates?

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QUESTION:

A parallel-plate capacitor with only air between the plates is charged by connecting it to a battery. The capacitor is then disconnected from the battery, without any of the charge leaving the plates. (a) A voltmeter reads 45.0 V when placed across the capacitor. When a dielectric is inserted between the plates, completely filling the space, the voltmeter reads 11.5 V. What is the dielectric constant of this material? (b) What will the voltmeter read if the dielectric is now pulled partway out so it fills only one-third of the space between the plates?

ANSWER:

Solution 65P Step 1 : Introduction : In this question, we need to find the dielectric constant of the parallel plate capacitor In the second part, we need to find the voltmeter reading if the dielectric is pulled partway out such that it fills of the space between the plates Data given Voltmeter reading without dielectric inserted V = 45.0 V i Voltmeter reading with dielectric inserted V = 11.f V

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