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In a moving iron instrument, the deflecting torque is:
  • a)
    ∝ i, where i is the current through the instrument
  • b)
    ∝ 1 / i2, where i is the current through the instrument
  • c)
    ∝ i2, where i is the current through the instrument
  • d)
    ∝ 1 / i, where i is the current through the instrument
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
In a moving iron instrument, the deflecting torque is:a)∝ i, wher...
In moving iron instruments, the deflecting torque is unidirectional (acts in the same direction) whatever may be the polarity of the current.
The deflecting torque is given by

Where,
i is operating current
L is self-inductance
θ is deflection
∴ Td∝i2
So that the deflection torque of the moving iron instrument is proportional to the square of the RMS value of the operating current and change in self-inductance.  
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Community Answer
In a moving iron instrument, the deflecting torque is:a)∝ i, wher...
Produced by the magnetic field generated by the current flowing through the coil
b) produced by the magnetic field generated by the permanent magnet
c) directly proportional to the current flowing through the coil
d) inversely proportional to the square of the current flowing through the coil
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In a moving iron instrument, the deflecting torque is:a)∝ i, where i is the current through the instrumentb)∝ 1 / i2, where i is the current through the instrumentc)∝ i2, where i is the current through the instrumentd)∝ 1 / i, where i is the current through the instrumentCorrect answer is option 'C'. Can you explain this answer?
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