A spring balance is calibrated at sea level. If this balance is used to measure the weight of a body at successive increasing heights from the surface of the earth, then the weight indicated by spring balance will

decrease continuously

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increase continuously

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first decrease, then increase

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remains constant

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Solution

The correct option is A decrease continuously
The acceleration due to gravity on or above earth is given by g = $\frac{G M}{r^{2}}$ , where r is distance from earth's center.
i.e. $g α \frac{1}{r^{2}}$
now as u increase the heights, r values takes $r_{e}, r_{e} + h, r_{e} + 2 h$ etc.
We can observe that, r is increasing and this implies that $g$ is decreasing accordingly.

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