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A spring-controlled instrument has a scale that is

  • A.necessarily non-uniform whatever the deflecting torque
  • B.uniform if the deflecting torque is proportional to the quantity
  • C.always cramped at the lower end of its range
  • D.always cramped at the upper end of its range

Answer: B

Spring torque grows in proportion to the deflection, so a deflecting torque proportional to the measured quantity gives equal divisions. A square-law deflecting torque gives the cramped scale of a moving iron instrument.

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