If an uncharged parallel-plate capacitor (capacitance C) is connected to a battery, one

Chapter 25, Problem 7

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If an uncharged parallel-plate capacitor (capacitance C) is connected to a battery, one plate becomes negatively charged as electrons move to the plate face (area A). In Fig. 25-26, the depth d from which the electrons come in the plate in a particularcapacitor is plotted against a range of values for the potential difference V of the battery. The density of conduction electrons in the copper plates is 8.49 1028 electrons/m3. The vertical scale is set by ds 1.00 pm, and the horizontal scale is set by Vs 20.0 V. What is the ratio C/A? d (pm)VsV (V)0Figure 25-26 7.

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