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BITSAT 2013
Exam
BITSAT
Year
2013
Subject
Physics
Chapter
Gravitation

BITSAT 2013 · Physics · Gravitation

There is a shell of mass M and density of the shell is uniform. The...

There is a shell of mass M\mathrm{M} and density of the shell is uniform. The work done to take a point mass from point A\mathrm{A} to B\mathrm{B} is [[\mathrm{AB}=\mathrm{r}]] There is a shell of mass M and density of the shell is uniform. The work done to take a point mass from point A to B is

Options

  1. AGmMr\frac{\mathrm{GmM}}{\mathrm{r}}
  2. BGmMR\frac{\mathrm{GmM}}{\mathrm{R}}
  3. C−GmMr-\frac{\mathrm{GmM}}{\mathrm{r}}
  4. Dzero

Correct answer

D. zero

Step-by-step solution

Gravitaional field inside the shell is zero, so no work required.
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