The unknown resistance Ru of a resistance thermometer is to be measured by a bridge circuit of the form shown in Figure below where the bridge components and the excitation voltage are different to the values shown (at 20 c), having instead the following values:

a)Using Thevenin's theorem, derive an expression for the output voltage Vm b)If the resistance thermometer has a sensitivity of 400 m 2 /C, calculate the temperature measurement sensitivity (at 40 C) in bridge output volts (Vm) per C. (i.e., find Vm)