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Discussion

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

Answer: A

Since heating ∝ I2, scale is cramped.

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