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Chapter 21: Q20CQ (page 772)
Apply the junction rule to junction b in figure below. Is any new information gained by applying the junction rule at \({\rm{e}}\)? (In the figure, each emf is represented by script \({\rm{E}}\).)
No new information is gained by applying junction rule at e.
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When charging a capacitor, as discussed in conjunction with Figure 21.38, how long does it take for the voltage on the capacitor to reach emf? Is this a problem?
Apply the loop rule to loop \({\rm{afedcba}}\) in Figure \({\rm{21}}{\rm{.47}}\)
Electric fish generate current with biological cells called electro-plaques, which are physiological emf devices. The electro-plaques in the South American eel are arranged in \(140\) rows, each row stretching horizontally along the body and each containing \(5000\) electro-plaques. Each electro-plaque has an emf of \(0.15{\rm{ }}V\) and internal resistance of \(0.25{\rm{ }}\Omega \). If the water surrounding the fish has resistance of \(800{\rm{ }}\Omega \), how much current can the eel produce in water from near its head to near its tail?
If two household lightbulbs rated 60W and 100W are connected in series to household power, which will be brighter? Explain.
Apply the loop rule to loop aedcba in Figure 21.25
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