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If the current through a moving iron instrument is increased by 20%, what is the percentage increase in the deflection torque?
  • a)
    40
  • b)
    25
  • c)
    32
  • d)
    44
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
If the current through a moving iron instrument is increased by 20%, w...
Concept:
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
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.
Calculation:
When the current through a moving iron instrument is increased by 20%, then deflection torque is
∴ T'd = 1.44 Td
Hence deflection torque is increased by 44%
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If the current through a moving iron instrument is increased by 20%, what is the percentage increase in the deflection torque?a)40b)25c)32d)44Correct answer is option 'D'. Can you explain this answer?
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