Physics · 2020
JEE Main · 2 September 2020, Shift 1 · Q6
The mass density of a spherical galaxy varies as K/r over a large distance 'r' from its centre. In that region, a small star is in a circular orbit…
The mass density of a spherical galaxy varies as $\displaystyle \frac{\mathrm{K}}{\mathrm{r}}$ over a large distance 'r' from its centre. In that region, a small star is in a circular orbit of radius R . Then the period of revolution, T depends on R as :
Official answer
(2)
$\displaystyle \mathrm{T}^2 \propto \mathrm{R}$
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JEE Main 2020 Physics question, with the answer from NTA’s final answer key. Where our answers come from.