What happens to the sensitivity of a Wheatstone bridge if the resistances are made equal?
Correct Answer: Sensitivity becomes infinite.
- Step 1: Understand what a Wheatstone bridge is. It is a circuit used to measure unknown resistances by balancing two legs of a bridge circuit.
- Step 2: Know that the Wheatstone bridge has four resistors: R1, R2, R3, and R4.
- Step 3: When the resistances R1 and R2 are equal, and R3 and R4 are also equal, the bridge is balanced.
- Step 4: Sensitivity in this context refers to how much the output changes when there is a small change in resistance.
- Step 5: If R1 = R2 and R3 = R4, even a tiny change in one of the resistors will cause a large change in the output voltage.
- Step 6: This means that the sensitivity of the Wheatstone bridge becomes very high, or infinite, because the output reacts strongly to small changes.
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