Question

A multiloop circuit is given. Some circuit quantities are not labeled. It is not necessary to solve the entire circuit.In Fig. 26.8, the current I2 is closest to:

-0.1 A / +0.5 A / -0.3 A / +0.1 A / +0.3 A

Answer 1

On using KVL in the loop of \(I_{2}\) :

\(\begin{aligned}-11-\left(25 \times I_{2}\right)+(0.3 \times 30)-17+(0.5 \times 23) &=0 \\-28-25 I_{2}+9+11.5 &=0 \\-25 I_{2}-7.5 &=0 \\-25 I_{2} &=7.5 \\ I_{2} &=\frac{-7.5}{25}=-0.3 \\ & I_{2}=-0.3 \mathrm{~A} \end{aligned}\)