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In the circuit shown in Fig, the sources...

In the circuit shown in Fig, the sources have `emf's xi_(1) = 1.5 V, xi_(2) = 2.0 V, xi_(3) = 2.5 V` , and the resistances are equal to `R_(1) = 10 Omega, R_(2) = 20 Omega, R_(3) = 30 Omega`. The internal resistances of the sources are negligible. Find : ltbrtgt (a) the current flowing thorugh teh resistance `R_(1)` ,
(b) a potential differences `varphi_(A) - varphi_(B)` between the points `A` and `B` between the points `A` and `B`.

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