A particle of mass \( \mathrm{M} \) is at a distance a from surface of a thin spherical shell of...

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A particle of mass \( \mathrm{M} \) is at a distance a from surface of a thin spherical shell of equal mass and having radius a.
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(A) Gravitational field and potential both are zero ar centre of the sheil.
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(B) Gravitational field is zeto not only inside the oheli but at a point outside the shell also.
(C) inside the shell, gravitational field alone is zero.
(D) Neather gravitational field nor gravitational potential is zero inside the shell.
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