Solved: An automobile gasoline gauge is shown
Chapter 27, Problem 84(choose chapter or problem)
An automobile gasoline gauge is shown schematically in Fig. 27-74. The indicator (on the dashboard) has a resistance of 10 n. The tank unit is a float connected to a variable resistor whose resistance varies linearly with the volume of gasoline. The resistance is 140 n when the tank is empty and 20 n when the tank is full. Find the current in the circuit when the tank is (a) empty, (b) halffull, and (c) full. Treat the battery as ideal.
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