Measurement and Instrumentation
A moving coil of a meter has 100 turns, and a length and depth of 10 mm and 20 mm respectively. It is positioned in a uniform radial flux density of 200 mT. The coil carries a current of 50 mA. The torque on the coil is

 100 µNm.
 2 µNm.
 1 µNm.
  200 µNm.

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Measurement and Instrumentation
Which of following statement are correct in case of power factor meter?

 Both B and C.
 It consist of two coils mounted at right angles to each other.
 The restoring torque is provided by a controlling torque.
 The deflection is proportional to phase angle between field coil and crossed coil.

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