The occurrence of the rotating motion of an object in the liquid medium can be inspected by ________. 

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RPF SI (2018) Official Paper (Held On : 12 Jan 2019 Shift 1)
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  1. Relative effect
  2. Magnetic Effect
  3. Spin effect
  4. Magnus Effect

Answer (Detailed Solution Below)

Option 4 : Magnus Effect
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Detailed Solution

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The correct answer is Magnus Effect.

Key Points

  • The Magnus effect is a phenomenon where a spinning object moving through a fluid (such as air or water) creates a whirlpool of fluid around itself, resulting in a force that acts perpendicular to the direction of motion.
  • This effect is commonly observed in sports, such as in the curved path of a spinning soccer ball, tennis ball, or baseball.
  • The Magnus effect is named after the German physicist Heinrich Gustav Magnus, who investigated the phenomenon in the 1850s.
  • In practical applications, the Magnus effect is used in the design of certain types of projectiles and in the aviation industry to control the flight path of aircraft.

Additional Information

  • Applications of the Magnus Effect
    • In sports, the Magnus effect is responsible for the curved trajectories seen in soccer, tennis, and baseball.
    • In aviation, the effect is used to enhance the lift and control of aircraft.
    • It is also used in the design of spin-stabilized projectiles and missiles to improve accuracy and range.
  • Understanding the Magnus Effect
    • When an object spins, it drags a layer of fluid around it, creating a difference in pressure on opposite sides of the object.
    • This pressure difference results in a lift force perpendicular to the direction of the object's motion.
    • The direction and magnitude of the force depend on the speed of rotation and the velocity of the object through the fluid.
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