Measurement and Instrumentation
A bridge circuit is shown in the figure below. Which one of the sentence given below is most suitable for balancing the bridge?

 First adjust R2 and then adjust R3.
 First adjust R4 and then adjust R2.
 First adjust R4 and then adjust R1.
 First adjust R2 and then adjust R4.

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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 ture and R is false.
 Both A and R are true and R is correct explanation of A.
 A is false and R is ture.

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