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JEE ADVANCE 2010
paper 1
Question
A thin uniform annular disc (see figure) of mass M has outer radius 4 R and inner radius 3R. The work required to take a unit mass from point P on its axis to infinity is
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Select the correct option:
A
$\frac{2 \mathrm{GM}}{7 \mathrm{R}}(4 \sqrt{2}-5)$
B
$-\frac{2 \mathrm{GM}}{7 \mathrm{R}}(4 \sqrt{2}-5)$
C
$\frac{\mathrm{GM}}{4 \mathrm{R}}$
D
$\frac{2 \mathrm{GM}}{5 \mathrm{R}}(\sqrt{2}-1)$
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
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