An electric motor with “constant output power” will

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An electric motor with “constant output power” will have a torque-speed characteristic in the form of a

1. straight line through the origin
2. straight line parallel to the speed axis
3. circle about the origin
4. rectangular hyperbola

Correct Option: B

E_αI_α = Tω
⇒ Tω = constant
⇒ Tω = C