Find the current through the resistor R_4 if R_1= R_2=R_3=20 Ω, R_4=40 Ω. The emf of the battery ...

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Find the current through the resistor R_4 if R_1= R_2=R_3=20 Ω, R_4=40 Ω. The emf of the battery is 4  V.

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