114CHAPTER 18 18.19(a) Applying Kirchhoff’s loop rule, as you go clockwise around the loop, gives ( ) ( ) ( )20.0 V2 00030.0 V2 50025.0 V5000II+−−−I=, or 33.0010A3.00 mAI−=×=(b) Start at the grounded point and move up the left side, recording changes in potential as you go, to obtain ( )( ) ( )( )3320.0 V2 0003.0010A30.0 V10003.0010AAV=+−Ω×−−Ω×or 19.0 VAV=−(c) ()( )( )315001 5003.0010A4.50 VV−∆= Ω×=(The upper end is at the higher potential.) 18.20Following the path of from ato b, and recording changes in potential gives
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