2. You have a 350 strain gage with a gage factor of 2.00. Sketch the Wheatstone Bridge circuit for a bridge arrangement using the 3-wire connection. Given an excitation voltage of 10 V, what is the output for a strain of 1,000 ? Why use 3 wires when the strain gage has only 2 terminals?

3. Repeat problem 2, but now use 2 strain gages in a bridge circuit (yes, the 3-wire part is now unnecessary.) The gages are on a cantilevered beam in bending. The strain on the second gage is equal and opposite to the strain in the first, in other words, 1 = -2. This time, also include lead wire resistance, assuming 10 per run.

4. Use the circuit from problem 3, but the application is a beam in tension. That means one gage is along the direction of the stress, the other is perpendicular to the first. Poisson's ratio for the material = 0.25. Strain in the loading direction is 500, what is the output of the bridge circuit?