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

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: Option A

Explanation:

Since heating ∝ I2, scale is cramped.