JEE MainPhysicsGravitationMCQ+4 / −1
Correct formula for height of a satellite from earths surface is :
- A
- B
- C
- D
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Correct answer: A
-
Let the satellite orbit at a distance from the center of the Earth.
If is the height from Earth’s surface, then where is Earth’s radius.
-
For a satellite in circular orbit, gravitational force provides the centripetal force:
Using ,
-
Rearranging, so
-
Now use the relation at Earth’s surface: hence
Substitute into the expression for :
-
Therefore,
-
Since height above Earth’s surface is ,
-
Compare with the options:
- A: ✅
- B: wrong power and wrong denominator
- C: wrong sign of power and wrong final operation
- D: is in denominator, which is incorrect
Therefore, the correct option is A.
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