Question: A moving iron ammeter produces a full-scale torque of 240 ?N-m with a deflection of 120° at a current of 10 A. the rate of change of self-inductance (?H/rad) of the instrument at full scale is?
Options
A : 2.0 ?H/rad
B : 4.8 ?H/rad
C : 12.0 ?H/rad
D : 114.6 ?H/rad
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