Task id16520

The consumer is located at a distance l = 20 km from the direct current source. Between them is a two-wire communication line with a resistance of R = 400 Ohms. A short circuit occurred on the line, and at the current source the voltmeter showed voltage U, = 10 V, and the milliammeter showed current I, = 40 mA. At what distance from the current source did the short circuit occur?