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Gravity control is used instead of spring control where

  • A.the instrument can be relied on to stand in one position
  • B.the instrument must be portable and used at any angle
  • C.the scale is required to be uniform throughout its length
  • D.the instrument is to be used on alternating current only

Answer: A

A weight on an arm gives a controlling torque proportional to the sine of the deflection, which needs the instrument level and gives a cramped scale at the lower end. Springs work in any position, which is why portable instruments use them.

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