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
${R^n}$
${R^{\left( {{{n - 1} \over 2}} \right)}}$
${R^{\left( {{{n + 1} \over 2}} \right)}}$
${R^{\left( {{{n - 2} \over 2}} \right)}}$
Solution
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