8.1 We first find the axial stress:

Rearranging Eq. 8.1:

Rearranging Eq. 8.6:

 

8.2 We assume that the bridge is initially balanced.

Vs = 2 V

Vo = 12.5 mV

S = 2.09

R2 = 120 W

R3i = 120 W

From Eq. 8.22, we find that the strain is: