Assertion : Two spherical shells have masses `m_(1) and m_(2)`. Their radii are `r_(1) and r_(2)`. Let `r` be the distance of a point from centre. Then gravitational field strength and gravitational potential both are equal to zero for `O lt r lt r_(1)`

Reason : In the region `r_(1) lt r lt r_(2)`, gravitational field strength due to `m_(2)` is zero. But gravitational potential due to `m_(2)` is constant (but non-zero).

Options

A. If both Assertin and Reason are correct and Reason is the correct explanation of Assertion
B. If both Assertion and Reason are correct but Reason is not the correct explanation of Assertion
C. If Assertion is true but Reason is false
D. If Assertion is false but Reason is true

Answer

D

Explanation

In the region `0 lt r lt r_(1)`
F = 0 but `v` = constant.