Correct Answer - Option 1 : Linear
Concept:
In thermocouple instruments, the deflection is directly proportional to the square of the current. i.e. θ ∝ I2
In moving iron instruments, the deflection is directly proportional to the square of the current. i.e. θ ∝ I2
In hotwire instruments, the deflection is directly proportional to the square of the current. i.e. θ ∝ I2
In moving-coil instruments, the deflection is directly proportional to the current. i.e. θ ∝ I
Application:
Moving coil instruments have a uniform or linear scale.