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Find out polarity and value of voltages by use Kirchhoff law

The voltages demonstrated in the circuit of figure in below have no assigned directions demonstrated but have the magnitudes as given here:

V1 = 3V, V2 = 4.5V, V3 = 7V, V4 = 2.5V and E1 = 6V, E2 = 20V, E3 = 2E4.

By applying Kirchhoff's Voltage Law to the circuit, find out the polarity and value of the voltages E3 and E4.

331_polarity and value of the voltages.png

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