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An iron sphere is suspended with a sprin...

An iron sphere is suspended with a spring. The length of the spring increases. When the sphere is completely in water, the extension in the length of the spring decreases. Why does it happen so?

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The increase in the length of the spring is due to the weight of the sphere. When the sphere is completely immersed in water, the weight of the sphere decreases due to buoyant force acting on it due to water. Since the net force acting on the spring decreases. The extension in the length of the spring decreases.
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