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Variation of G Due to the Rotation of Earth

The distance ...

Question

The distance of a geostationary satellite from the centre of earth (radius R = 6400 Km) is nearly.

A

18 R

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B

10R

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C

7R

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D

5R

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Solution

The correct option is C 7R
A geostationary satellite is placed at an altitude of about 36000 km from the earth surface.
So, its distance from centre of earth, $r = 36000 + 6400 k m = 42400 k m$
$d = \frac{42400}{6400} R \approx 7 R$

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