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Gravitation
Mass density of a solid sphere is $\rho$. Radius of sphere is R. The gravitational field at a distance $r$ from the center of the sphere inside it is
\[(a)\;\frac{4 \rho G \pi r}{3} \quad (b)\;\frac{4 \rho G \pi r^2}{3} \quad (c)\;\frac{4 \rho G \pi R^3}{3r^2} \quad (d)\;\frac{ \rho G R^3}{\pi r} \]
jeemain
physics
class11
unit6
gravitation
q80
medium
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asked
Aug 26, 2013
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meena.p
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Jul 10, 2014
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1 Answer
Gravitational Potential energy at a distance r from center where $r \leq R$ is
$ E(r) =\large\frac{GM}{R^3} r$
$ \qquad =\large\frac{Gr}{R^3}\bigg(\frac{4}{3} $$ \pi R^3 \rho\bigg)$
$\qquad =\large\frac{4 G r \pi \rho}{3}$
Hence a is the correct answer.
answered
Aug 26, 2013
by
meena.p
edited
Feb 18, 2014
by
meena.p
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