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why is the wheatstones brigde most sensitive when all four resistances are equal

why is the wheatstones brigde most sensitive when all four resistances are equal
 

Grade:12

1 Answers

Vikas TU
14149 Points
6 years ago
Dear Student,
Current through perfect galvanometer=Iac.
=>IAC=V⋅f(R1,R2,R3,R4) 
for this situation R1=R2=R3=R4 
Sensitivity=dIac/dRx 
x can be 1,2,3,4 
The stationary focuses are then found by 
dS/dR1=0 
dS/dR2=0 
so on. 
At the point when every one of the resistances are equivalent, there will be one stationary point. Hence more is the affectability 
 
Cheers!!
Regards,
Vikas (B. Tech. 4th year
Thapar University)

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