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The scale of a dynamometer wattmeter is

  • A.cramped at the lower end
  • B.open at the lower end and cramped at the upper end of its range
  • C.uniform only over the middle third of its length
  • D.uniform

Answer: D

The rate of change of mutual inductance with angle is made nearly constant by the shaping of the coils, so the deflection is proportional to the power and the divisions are equal. This is in contrast with the moving iron and hot wire movements, whose scales are square law.

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