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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...
Proportional to the square of the current passing 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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