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GATE2019 IN: 42

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​​​​​​Four identical resistive strain gauge factor of 2.0 used in a wheatstone bridge as shown in the figure below. Only one of the strain gauges R${_S}{_E}{_N}{_S}{_E}$ changes its resistance due to strain. If the output voltage V${_O}{_U}{_T}$ is measured to be1 m V, the measured of strain, in units of microstrain, is

  1. $1$
  2. $10$
  3. $100$
  4. $1000$

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