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

 1 Nm.
  200 Nm.
 100 Nm.
 2 Nm.

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Measurement and Instrumentation
In measurement system, the function of the signal manipulating elements is to

 change the quantity under measurement to an analogues signal.
 change the magnitude of the input signal while retaining its identity.
 to perform non liner operation like clipping filtering, chopping and clamping.
 to perform linear operation like addition and multiplication.

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