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If we increase the angular speed of the rotor, the power of it will _________

  1. decrease
  2. increase
  3. first increase then decrease
  4. first decrease then increase

Answer (Detailed Solution Below)

Option 2 : increase
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Detailed Solution

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CONCEPT:

  • Torque: The twist to an object around a specific axis is called torque. It is the vector product of position vector and force.
    • It is also known as the turning effect.
  • The power of the rotor required to transmit energy to apply a torque τ to rotate it with angular velocity ω is

P = τ ω

EXPLANATION:

The power of a rotating rotor is given by

P = τ ω

P ∝ ω 

  • So, if we increase the angular speed of the rotor, the power will increase.
  • Hence, the correct answer is option 2.
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