Q.

Dependence of intensity of gravitational field (E) of earth with distance (r) from centre of earth is correctly represented by

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answer is A.

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Detailed Solution

For a point inside the earth i.e. r < RE=−GMR3rwhere M and R be mass and radius of the earth respectively. At the centre, r = 0∴ E=0For a point outside the earth i.e. r > R, E=−GMr2 On the surface of the earth i.e. r = RE=−GMR2The variation of E with distance r from the centre is as shown in the figure.

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