Sources of EMF E1 = 2, 1 = E2, E3 = 7, E4 E5 = 5 V = 4 are connected to the circuit in the picture below. The resistance of the connecting wires can be ignored, and the internal resistance of all sources of EMF are both equal to r = 1 ohm. What should be equal to the value of E6 to the source of EMF through E6 current flows?

Detailed solution shorthand terms, formulas, laws used in the decision, the withdrawal of the calculation formula and the response.

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