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A half bridge arrangement of strain gauges on a beam in bending uses

  • A.two active gauges, one in tension and one in compression
  • B.one active gauge and three fixed resistors in the other arms
  • C.four active gauges, two in tension and two in compression
  • D.two gauges bonded at right angles to one another at the same point

Answer: A

One gauge on the top surface goes into tension and one on the bottom into compression, and placing them in adjacent arms doubles the output while cancelling any change common to both, temperature included. A full bridge with four gauges doubles it again.

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