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The deflecting torque in a moving iron meter:
  • a)
    is proportional to the square of the voltage
  • b)
    is inversely proportional to the square of the current
  • c)
    is inversely proportional to the current
  • d)
    is proportional to the square of the current
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
The deflecting torque in a moving iron meter:a)is proportional to the ...
Deflecting torque:
The torque needed to move the pointer over a calibrated scale is known as deflecting torque and it can overcome the inertia of the moving system, controlling torque and damping torque.
In moving iron instruments, the deflecting torque is given by

I is the operating current in Ampere
L is the inductance in Henry
θ is the deflection angle in radians
As the operating torque is directly proportional to the square if the operating current. Hence, this instrument possesses high operating torque.
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The deflecting torque in a moving iron meter:a)is proportional to the ...
Deflecting torque:
The torque needed to move the pointer over a calibrated scale is known as deflecting torque and it can overcome the inertia of the moving system, controlling torque and damping torque.
In moving iron instruments, the deflecting torque is given by

I is the operating current in Ampere
L is the inductance in Henry
θ is the deflection angle in radians
As the operating torque is directly proportional to the square if the operating current. Hence, this instrument possesses high operating torque.
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The deflecting torque in a moving iron meter:a)is proportional to the square of the voltageb)is inversely proportional to the square of the currentc)is inversely proportional to the currentd)is proportional to the square of the currentCorrect answer is option 'D'. Can you explain this answer?
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