Question: Two strain gauges with a gauge factor K (which will be the last 2 digits of your student number) are placed on the chest and

Two strain gauges with a gauge factor K (which will be the last 2 digits of your student number) are placed on the chest and belly (diaphragm) area of a subject as shown in below figure. The gauges have an initial resistance of 100o and they are connected to the given Wheatstone Bridge circuit. And output of Wheatstone Bridge circuit is connected to an instrumentation amplifier as shown in below figure. The gauges measures the extension of chest and belly according to respiration. The resistance values for amplifier is given below.

R1 = R2 = R4 1k, Rc = 1000, Rp = 5000, Vcc = 5V

When the subject exhaled the strain gauges are relaxed and when the subject inhaled strain gauge A is stretched 1% and B is stretched 2%. Answer the below questions when the subject is inhaled.

a) What will be the resistance value in the strain gauge A, R^ ?

b) What will be the resistance value in the strain gauge B, RB ?

c) What will be the voltage difference V-VA?

d) What will be the amplifier output Vo1?

Two strain gauges with a gauge factor K (which will be the

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