The inductance of a certain moving- iron ammeter is expressed as L = 10 + 3θ – (frac{θ^2}{4}) μH, where θ is the deflection in radian from the zero position. The control spring torque is 25 × 10-6 Nm/rad. The meter carries a current of 5 A. What is the deflection?
A. 2.4
B. 2.0
C. 1.2
D. 1.0
Answer:C
The inductance of a certain moving- iron ammeter is expressed as L = 10 + 3θ – (frac{θ^2}{4}) μH, where θ is the deflection in radian from the zero position. The control spring torque is 25 × 10-6 Nm/rad. The meter carries a current of 5 A. What is the deflection?
A. 2.4 B. 2.0 C. 1.2 D. 1.0