If the change in the value of "" at a height
above the earth's surface is the same as that of the change in the value of "
" at a depth
below it (both
and
are much smaller than the radius of the earth), then
The variation of with altitude
is given by the relation
Also, the variation of g with depth x is given as
Equating and
we get
Study 40% syllabus and score up to 100% marks in JEE