JEE Mains · Physics · STD 11 - 7. gravitation

The mass density of a spherical galaxy varies as \(\frac{ K }{ r }\) 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

A \(T \propto R\)
B \(T ^{2} \propto \frac{1}{ R ^{3}}\)
C \(T ^{2} \propto R\)
D \(T ^{2} \propto R ^{3}\)

Verified Solution

Answer & Solution

Correct Answer

(C) \(T ^{2} \propto R\)

Step-by-step Solution

Detailed explanation

\(dm =\rho dv\) \(dm =\left(\frac{ k }{ r }\right)\left(4 \pi r ^{2} dr \right)\) \(dm =4 \pi krdr\) \(M =\int_{0}^{ R } d m =\int_{0}^{ R } 4 \pi krdr\) \(M=\left.4 \pi k \frac{r^{2}}{2}\right|_{0} ^{R}\) \(M =2 \pi k \left( R ^{2}-0\right)\) \(M =2 \pi kR ^{2}\) for circular…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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