Numerical -Angular deflection for given parameters of electrodynamic ammeter

Q.  A electrodynamic ammeter has current flowing through it of 20 A and torsional constant of controlling spring of 10-6 N-m/degree. If the mutual inductance changes uniformly at the rate of 0.0025 μH/degree, then its angular deflection for full scale is
- Published on 05 Nov 15

a. 43.68 degree
b. 57.29 degree
c. 68.32 degree
d. 69.69 degree

ANSWER: 57.29 degree

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