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Suppose the resistances in the example are R1 = 2.5 Ω, R2 = 5.0 Ω and R3 = 7.5 Ω, respectively, and a new voltage source is provided. If the current measured in the 7.5-Ω resistor is 5.0 A, find the following. (a) the potential difference provided by the new battery and the currents in each of the remaining resistors.
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By what factor does the spring's potential energy increase? Since both distance and average force are doubled, the work done in stretching the spring is quadrupled. Equivalently, the potential energy of the spring is proportional to 2, x and hence doubling the stretch distance quadruples the spring's potential energy.
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