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

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

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Measurement and Instrumentation
A Manganin swap resistance is connected in series with a moving coil ammeter consisting of a milli ammeter and a suitable shunt in order to

 Obtaine large deflecting torque.
 Reduce the size of the meter.
  Minimize the effect of temperature variation.
 Minimize the effect of stray magnetic fields.

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