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(i) Find the current flowing through the...

(i) Find the current flowing through the resistance `R_(1)` of the cirucit shown in figure if the resistacnes are equal to `R_(1)=10Omega, R_(2)=20 Omega" and "R_(3)=30Omega,` and the potentials of points 1, 2 and 3 are equal to `varphi_(1)=10V, varphi_(2)=6V," and "varphi_(3)=5V.`

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