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 postioned in a uniform radial flux density of 200 mT. The coil carries a current of 50 mA. The torque on the coil is

 100 Nm.
 2 Nm.
 1 Nm.
  200 Nm.

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Measurement and Instrumentation
A DC potentiometer is the best means available for the measurement of DC voltage because

 None of above.
 It is possible to standardize before a measurement is undertaken.
 The precision in measurment is independent of the type of the defector used.
  It is based on null balance technique.

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