$A$ particle of mass $M$ is at a distance $a$ from the surface of a thin spherical shell of equal mass $M$ and radius $a$. Which of the following statements is correct regarding the gravitational field and potential inside the shell?
- AGravitational field and potential both are zero at the centre of the shell.
- BGravitational field is zero not only inside the shell but at a point outside the shell also.
- CInside the shell,gravitational field alone is zero.
- DNeither gravitational field nor gravitational potential is zero inside the shell.
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