JEE Main 2019 — Physics solution

JEE Main2019Physics

A solid sphere of mass ‘M’ and radius ‘a’ is surrounded by a uniform concentric spherical shell of thickness 2a and mass 2M. The gravitational field at distance ‘3a’ from the centre will be:

A
$\frac{GM}{9 a ^{2}}$
B
$\frac{2 GM}{9 a ^{2}}$
C
$\frac{GM}{3 a ^{2}}$
D
$\frac{2 GM}{3 a ^{2}}$

Solution

$E = \frac{GM}{( 3 a ) ^{2}} + \frac{2 GM}{( 3 a ) ^{2}} E = \frac{GM}{3 a ^{2}}$

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