Option 1: T = P/ω
Option 2: T = 1/2 i² dL/dθ
Option 3: T = BIlr
Option 4: T = E/ω
Correct Option: 2
Explanation
The standard torque equation of an SR motor is T = 1/2 i² (dL/dθ). Torque is proportional to square of current and exists only when inductance varies with rotor position.