Chapter 3, Problem 218P

The equivalent thermal resistance for the thermal circuit shown here is

${\text{(a) R}}_{\text{1}}{\text{2R}}_{\text{01}}+R_{23}A+R_{23}B+R_{3}4$ ${\text{(b) R}}_{\text{12}}{\text{R}}_{\text{01}}+\left(\frac{R_{23A}{R}_{23B}}{R_{23A}{R}_{23B}}\right)R_{34}$ $\text{(c)}\left(\frac{R_{12}{R}_{01}}{R_{12}{R}_{01}}\right)+\left(\frac{R_{23A}{R}_{23B}}{R_{23A}{R}_{23B}}\right)+\frac{1}{R_{34}}$ $\text{(d)}\left(\frac{R_{12}{R}_{01}}{R_{12}{R}_{01}}\right)+\left(\frac{R_{23A}{R}_{23B}}{R_{23A}{R}_{23B}}\right)+R_{34}$

(e) None of them