A particle of mass \( M \) is at a distance a from surface of a thin spherical shell of equal ma...

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A particle of mass \( M \) is at a distance a from surface of a thin spherical shell of equal mass and having radius a.
\( \mathrm{P} \)
W
(a) Gravitational field and potential both are zero at centre of the shell
b) Gravitational field is zero not only inside the shell but at a point outside the shell also
(c) Inside the shell, gravitational field alone is zero
(d) Neither gravitational field nor gravitational potential is zero inside the shell
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