Magnitude of buoyant force on a body completely immersed and floating in water when system is kept in elevator going downward with constant acceleration

remains unchanged

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increases

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decreases

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becomes zero

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Solution

The correct option is C decreases
We know that, Buoyant force = weight of displaced fluid.
Also, we know, weight of body decreases when accelerated downward and increases if accelerated upward.

Therefore, buoyant force will decrease as system is kept in elevator going downward with constant acceleration.

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