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+//===========================================================================

+//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));