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Diffstat (limited to '3871/CH10/EX10.12/Ex10_12.sce')
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1 files changed, 27 insertions, 0 deletions
diff --git a/3871/CH10/EX10.12/Ex10_12.sce b/3871/CH10/EX10.12/Ex10_12.sce new file mode 100644 index 000000000..3e01478d6 --- /dev/null +++ b/3871/CH10/EX10.12/Ex10_12.sce @@ -0,0 +1,27 @@ +//===========================================================================
+//chapter 10 example 12
+clc;clear all;
+
+//variable declaration
+P = 100; //resistance in arm AB in Ω
+Q = 1000; //resistance in arm BC in Ω
+S = 2000; //resistance in arm CD in Ω
+R = 202; //resistance in arm BD in Ω
+Rg = 200; //galvanometer resistance in Ω
+E = 5; //voltage in V
+Si = 5; //current sensitivity of the galavanometer in mm/uA
+
+//calculations
+Si1 = 5*10^9; //current sensitivity of the galavanometer in mm
+R1 = (P*S)/Q; //resistance required in arm BD for balance bridge
+dR = R-R1; //the deviation from balanced condition in Ω
+Eth = E*(((R1+dR)/(R1+dR+S))-(P/(P+Q))); //thevenin's open circuit voltage in V
+Rth = (((R1+dR)*S)/(R1+dR+S))+((P*Q)/(P+Q)); //thevenin's equivalent resistance of bridge in Ω
+Ig = Eth/(Rth+Rg); //galvanometer current in A
+d = Si1*Ig; //deflection of the galvanometre theta in mm
+S = d/dR; //sensitivity of the bridge in mm/Ω
+
+//result
+mprintf("galvanometer current = %3.2e A",Ig);
+mprintf("\ndeflection of the galvanometre theta = %3.1f mm",(d*10^-3));
+mprintf("\nsensitivity of the bridge = %3.2f mm/Ω",(S*10^-3));
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