Finding I3: Resistance Ratio Calculation

[hquang001]

Homework Statement

In the figure below, how can i apply current divider to find I3 ?

Relevant Equations

$$Ix = \frac{Rt}{Rt +Rx} I$$

Should it be $$I3 = \frac{(R2+R4)}{(R2+R4) +R3} I$$
or $$I3 = \frac{R2}{R2 +R3} I$$

 

[hquang001]

Homework Statement:: In the figure below, how can i apply current divider to find I3 ?
Relevant Equations:: $$Ix = \frac{Rt}{Rt +Rx} I$$

View attachment 280158
Should it be $$I3 = \frac{(R2+R4)}{(R2+R4) +R3} I$$
or $$I3 = \frac{R2}{R2 +R3} I$$

Ok i know the answer,
in this case R2 is not in series with R4 so the second answer is correct

 

[kuruman]

If you set $R_3=R_2$ which of the two choices gives you the expected answer $I_3=\dfrac{I}{2}$?

 

[hquang001]

If you set $R_3=R_2$ which of the two choices gives you the expected answer $I_3=\dfrac{I}{2}$?

The second one

 

[kuruman]

Right.