Resistors R1 and R2 in the bridge circuit shown in the given figure are the strain gauge elements of 5kΩ each. Resistors R3 and R4 are fixed resistors, with values of 4.3 kW. A digital voltmeter with ranges of 10V, 1V, and 0.1V, and a resolution of 0.1% of FSD, is used to measure the output voltage. What is the minimum change in R1 that can be detected by the meter? Assume the supply E is 10V.a)0.5 ohmb)1.5 ohmc)1 ohmd)0.75 ohmCorrect answer is option 'C'. Can you explain this answer?

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Resistors R₁and R₂ in the bridge circuit shown in the given figure are the strain gauge elements of 5kΩ each. Resistors R₃ and R₄ are fixed resistors, with values of 4.3 kW. A digital voltmeter with ranges of 10V, 1V, and 0.1V, and a resolution of 0.1% of FSD, is used to measure the output voltage. What is the minimum change in R₁ that can be detected by the meter? Assume the supply E is 10V.

a)
0.5 ohm
b)
1.5 ohm
c)
1 ohm
d)
0.75 ohm

Correct answer is option 'C'. Can you explain this answer?

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Resistors R1 and R2 in the bridge circuit shown in the given figure a...

The voltage at point C will be 5.0V, because R₃ = R₄, and the voltage at C equals one-half of the supply voltage. The voltmeter can use the 0.1V range, because the offset is 0V, giving a resolution of 0.1 mV. The voltage that can be sensed at A is given by

E_AD = 10 × R₂/(R₁ + R₂) = 5.00 + 0.0001V

R₁ = (50,000/50,001) − 5,000Ω

R₁ = −49,999

Resolution = 1Ω

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Resistors R1 and R2 in the bridge circuit shown in the given figure are the strain gauge elements of 5kΩ each. Resistors R3 and R4 are fixed resistors, with values of 4.3 kW. A digital voltmeter with ranges of 10V, 1V, and 0.1V, and a resolution of 0.1% of FSD, is used to measure the output voltage. What is the minimum change in R1 that can be detected by the meter? Assume the supply E is 10V.a)0.5 ohmb)1.5 ohmc)1 ohmd)0.75 ohmCorrect answer is option 'C'. Can you explain this answer?

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