Question:
The scale of a PMMC instrument is
The scale of a PMMC instrument is
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PMMC instruments have uniform scale because deflection is directly proportional to current.
Updated On: May 27, 2026
- Non-uniform
- Uniform
- Logarithmic
- Exponential
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The Correct Option is B
Solution and Explanation
Concept:
PMMC stands for Permanent Magnet Moving Coil instrument.
Step 1: In a PMMC instrument, deflecting torque is directly proportional to current. \[ T_d\propto I \]
Step 2: Controlling torque is proportional to angle of deflection. \[ T_c\propto \theta \]
Step 3: At equilibrium: \[ T_d=T_c \] So: \[ \theta\propto I \]
Step 4: Since deflection is directly proportional to current, the scale is uniform. Therefore: \[ \boxed{\text{Uniform}} \]
Step 1: In a PMMC instrument, deflecting torque is directly proportional to current. \[ T_d\propto I \]
Step 2: Controlling torque is proportional to angle of deflection. \[ T_c\propto \theta \]
Step 3: At equilibrium: \[ T_d=T_c \] So: \[ \theta\propto I \]
Step 4: Since deflection is directly proportional to current, the scale is uniform. Therefore: \[ \boxed{\text{Uniform}} \]
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