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JEE Main Physics Class 11 Gravitation Part 1 Questions
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© examsnet.com
Question : 85
Total: 100
This question contains Statement-1 and Statement-2. Of the four choices given after the statements, choose the one that best describes the two statements.
Statement-1 :
For a mass M kept at the centre of a cube of side ‘a’, the flux of gravitational field passing through its sides 4 π GM. and
Statement-2:
If the direction of a field due to a point source is radial and its dependence on the distance ‘r’ from the source is given as
1
r
2
,
its flux through a closed surface depends only on the strength of the source enclosed by the surface and not on the size or shape of the surface.
[2008]
Statement -1 is false, Statement-2 is true
Statement -1 is true, Statement-2 is true; Statement -2 is a correct explanation for Statement-1
Statement -1 is true, Statement-2 is true; Statement - 2 is not a correct explanation for Statement-1
Statement -1 is true, Statement-2 is false
Validate
Solution:
Gravitational field,
E
=
−
G
M
r
2
Flux,
ϕ
=
∫
→
E
g
.
→
d
S
=
|
E
.
4
π
r
2
|
=
−
4
π
G
M
where,
M
=
mass enclosed in the closed surface
This relationship is valid when
|
→
E
g
|
µ
1
r
2
.
© examsnet.com
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