Numerical - Current in the coil of a moving iron ammeter

Q.  For a moving iron ammeter, the change of inductance is 3 μ H / degree and its spring constant is 4 X10 -7 N – m / degree. If the maximum deflection of the pointer is 90 degree, then the corresponding current in the coil be

- Published on 10 Sep 15

a. 3.89 A
b. 4.05 A
c. 4.89 A
d. 5 A

ANSWER: 4.89 A

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