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The full-scale deflecting torque of a 20 A moving-iron ammeter is...

This question belongs to Electronics And Communications Engineering Measurement And Instrumentation
Measurement and Instrumentation
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The full-scale deflecting torque of a 20 A moving-iron ammeter is 6 × 10-5 N-m. What is the rate of change of self-inductance with respect to the deflection of the pointer of the ammeter at full scale?

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Correct Answer: Option D
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