   Chapter 18, Problem 68AP

Chapter
Section
Textbook Problem

2.00-nF capacitor with an initial charge of 5.10 μC is discharged through a 1.30-kΩ resistor. (a) Calculate the magnitude of the current in the resistor 9.00 μs after the resistor is connected across the terminals of the capacitor. (b) What charge remains on the capacitor after 8.00 μs? (c) What is the maximum current in the resistor?

(a)

To determine
The expression for Rx in terms of observable resistances R1 and R2 .

Explanation

Given Info: The unknown resistance Rx between the points C and E, and the unknown resistance Ry between the points A and B

Explanation:

Formula to calculate the unknown resistance Ry from the figure 1

Rab=R1

• Rab is the resistance between the points a and b,
• R1 is the resistor,

Rewrite the expression.

R1=Ry+Ry=2RyRy=12R1 (1)

Formula to calculate the resistance Rac between the points a and c from the figure 2

Rac=R2

• Rac is the resistance between the points a and c,
• R2 is the resistor,

Rewrite the expression

(b)

To determine
The unknown resistance Rx   and the grounding of the station is adequate or not.

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