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A satellite A of mass m is at a distance of r from the centre of the earth. Another satellite B of mass 2 m is at a distance of 2 r from the earth's centre. Their time periods are in the ratio of

1. 1 : 2
2. 1 : 16
3. 1 : 32
4. 2 2 : 1

Correct answer: 2 2 : 1

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