Wheatstone bridge problem and solution calculate uncertainty
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The cross section area A is
A = 3.5 x 0.55[cm
2
] = 1.925*10-4 [m2 ]
The stress σ [kN/ m
2
] is
σ = F/A = 12 /(1.025 10-4 ) = 62.3 103
The resulting strain is
ε =σ / E= ( 62.3 103
) / (205 106
)= 0.304 10-3[m/m]
The change in resistance is:
)R = RγG = (100) ( 0.304*10-3) (2.2) = 0.067 Ω
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