34_Chapter 18 HomeworkCH18 Direct-Current Circuits

34_Chapter 18 HomeworkCH18 Direct-Current Circuits - 132...

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132 CHAPTER 18 18.55 (a) For the first measurement, the equivalent circuit is as shown in Figure 1. From this, 1 2 ab yy y RRRR R ==+= so 1 1 2 y RR = (1) For the second measurement, the equivalent circuit is shown in Figure 2. This gives 2 1 2 ac y x RR RR == + (2) Substitute (1) into (2) to obtain 21 11 22 x R  =+   , or 1 4 x R =− (b) If R , then 12 13 and 6.0 R =Ω = Ω 2.8 x R = Since this exceeds the limit of 2.0 , the antenna is inadequately grounded . 18.56 Assume a set of currents as shown in the circuit diagram at the right. Applying Kirchhoff’s loop rule to the leftmost loop gives
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