Question

Select One Option Correct from the following : A thin uniform annular disc (see figure) of mass M has outer radius 4R and inner radius 3R. The work required to take a unit mass from point P on its axis to infinity is
(A)$\frac{2GM}{7R} (4\sqrt{2} -5)$
(B)$-\frac{2GM}{7R} (4\sqrt{2} -5)$
(C)$\frac{GM}{4R}$
(D)tex]\frac{2GM}{5R} (\sqrt{2} -1) [/tex]

Answer 1

a option is correct.
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Answer 2

Select One Option Correct from the following : A thin uniform annular disc (see figure) of mass M has outer radius 4R and inner radius 3R. The work required to take a unit mass from point P on its axis to infinity is

✔️ (A)$\frac{2GM}{7R} (4\sqrt{2} -5)$

(B)$-\frac{2GM}{7R} (4\sqrt{2} -5)$

(C)$\frac{GM}{4R}$

(D)tex]\frac{2GM}{5R} (\sqrt{2} -1) [/tex]