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

 2 µNm.
 100 µNm.
  200 µNm.
 1 µNm.

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Measurement and Instrumentation
Assertion (A): A hot wire ammeter has a cramped scale. Reason (R): The heat is proportional to square of current.

 Both A and R are true and R is not correct explanation of A.
 A is false and R is ture.
 Both A and R are true and R is correct explanation of A.
 A is ture and R is false.

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