Measurements and Instrumentation

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

A Both A and R are true and R is correct explanation of A

B Both A and R are true but R is not correct explanation of A

C A is true R is false

D A is false R is true

ANS:A - Both A and R are true and R is correct explanation of A

Since heating ∝ I², scale is cramped.

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