Measurement and Instrumentation
Which of the following instruments can be used to measure AC current only?

Moving iron ammeter
Moving iron voltmeter
Induction type ammeter
Permanent Magnet Type ammeter

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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.

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

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