ong its l ength of 4 m so that its cross section becomes tha

ong its l ength of 4 m so that its cross section becomes that of Figure 5.5. Find the resistance betwc square ends. Alead (r=5×106S/m) bar ofsquare cross section has a hole bored al of Example 5.4 FIGURE 5.5 Cross section of the lead bar of Exa I cm 3 cm Solution: Since the cross section of the bar is uniform, we may apply eq. (5.16); that is, 4Cm Hence, ati PRACTICE EXERCISE 5.4 If the hole in the lead bar of Example 5.4 is completely filled with copper (ra 5.8× 10 S/m),determinetheresistanceofthe completely filled with copper 5.8 x 10\' S/m), determine the resistance of the composite bar Answer: 461.7 .

Solution

In the given problem cross section is given which is combined with two different materials. To know wheather the resistances are series or parallely connected. first assume terminals of the two bars. Each bar will have 2 terminals. now imagine terminals are connected in series or parellel. For given exercise the resisters are connected in parallel.