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A star can be considered as spherical ba...

A star can be considered as spherical ball of hot gas of radius `R`. Inside the star, the density of the gas is `rho_(r)` at radius `r` and mass of the gas within this region is `M_(r)`.
The correct differential equation for variation of mass with respect to radius is (refer to the adjacent figure)

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The correct Answer is:
`(dm_r)/(dr)=rhor4pir^2`
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