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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
$$\frac{2GM}{7R}(4\sqrt{2} - 5)$$
$$-\frac{2GM}{7R}(4\sqrt{2} - 5)$$
$$\frac{GM}{4R}$$
$$\frac{2GM}{5R}(\sqrt{2} - 1)$$
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