The change in the value of g at a height ‘h’ above the surface of the earth is the same as at a depth ‘d’ below the surface of earth. When both ‘d’ and ‘h’ are much smaller than the radius of earth, then which one of the following is correct?
d =h/2
d=3h/2
d =2h
d =2h
C.
d =2h
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 – I:
For a mass M kept at the centre of a cube of side ‘a’, the flux of gravitational field passing through its sides is 4π GM.
and
Statement – II
If the direction of a field due to a point source is radial and its dependence on the distance ‘r’ for the source is given as 1/r2, 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
Statement – 1is false, Statement – 2 is true.
Statement – 1is true, Statement – 2 is true; Statement -2 is 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 true; Statement -2 is not a correct explanation for Statement-1.
B.
Statement – 1is true, Statement – 2 is true; Statement -2 is correct explanation for Statement-1.
g = GM/r2
Average density of the earth
does not depend on g
is a complex function of g
is directly proportional to g
is directly proportional to g
C.
is directly proportional to g
If gE and gm are the accelerations due to gravity on the surfaces of the earth and the moon respectively and if Millikan’s oil drop experiment could be performed on the two surfaces, one will find the ratio (electronic charge on the moon/ electronic charge on the earth) to be
1
0
gE/gM
gE/gM
A.
1