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Diffstat (limited to '3871/CH10/EX10.14')
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1 files changed, 26 insertions, 0 deletions
diff --git a/3871/CH10/EX10.14/Ex10_14.sce b/3871/CH10/EX10.14/Ex10_14.sce new file mode 100644 index 000000000..abd99aca8 --- /dev/null +++ b/3871/CH10/EX10.14/Ex10_14.sce @@ -0,0 +1,26 @@ +//===========================================================================
+//chapter 10 example 14
+
+clc;
+clear all;
+
+//variable declaration
+P = 500; //resistance in arm AB in Ω
+Q = 500; //resistance in arm BC in Ω
+S = 500; //resistance in arm CD in Ω
+R = 500; //resistance in arm BD in Ω
+Rg = 100; //galvanometer in Ω
+E = 10; //battery voltage in V
+Rth = 500; //thevenin's equivalent resistanceof bridge Ω
+Ig = 10^-9; //galavanometer capable of detecting Ig current in A
+
+//calculations
+//Eth = (E*dR)/(4*R);
+x = E/(4*R); //thevenin or open -circuit voltage in dR
+//Ig = Eth/(Rth+Rg)
+y = x/(Rth+Rg); //current through galvanometer
+dR = (Ig*(Rth+Rg))/x; //the smallest change in resistance that can be detected in Ω
+
+//result
+mprintf("the smallest change in resistance that can be detected = %3.2f m Ω",(dR*10^3));
+
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