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1 A distant telephone whose resistance is 300 ohm is connected to the exchange 10...

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1 A distant telephone whose resistance is 300 ohm is connected to the exchange 10 miles away by a pair of telephone wires whose resistance singly is 5 ohm per mile A twig falls across the wires at a certain point producing the effect of a resistance R connected between the wires at that point Measurements made at the exchange show a resistance between the terminals of the line of 130 ohm which rises to 160 ohm when the distant telephone is disconnected How far from the exchange is the fault to be found and what is the value of

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