Numerical -Current corresponding to given maximum deflection of pointer in moving iron ammeter

Q.  For a moving iron ammeter, the change of inductance is 3 μH/degree and its spring constant is 4 X 10-7 N-m/degree. If the maximum deflection of the pointer is 90 degree, then the corresponding current in the coil be
- Published on 04 Nov 15

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

ANSWER: 4.89 A

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