Assertion :If time period of a satellite revolving in circular orbit in equatorial plane is $24 h$ , then it must be a geostationary satellite. Reason: Time period of a geostationary satellite is $24 h$ .

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is D Assertion is incorrect but Reason is correct
A geostationary satellite remain above the equator and has time period of $24$ hours and revolve around earth from west to east.For a satellite to be geostationary, the necessary requirements are as follows:
a. Its orbit must be in equatorial plane and circular;
b. Its time period must be $24 h$ ;
c. Its sense of rotation must be the same as that of the earth about its own axis.

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