Suppose the gravitational force varies inversely as the nth power of distance. Then the time period of a planet in circular orbit of radius $R$ around the sun will be proportional to

  • A

    ${R^{\left( {\frac{{n + 1}}{2}} \right)}}$

  • B

    ${R^{\left( {\frac{{n - 1}}{2}} \right)}}$

  • C

    $R^n$

  • D

    ${R^{\left( {\frac{{n - 2}}{2}} \right)}}$

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