In a solid sphere two small symmetrical cavities are created whose centres lie on a diameter AB of sphere on opposite sides of the centre.

In a solid sphere two small symmetrical cavities are created whose cen

1.	In a solid sphere two small symmetrical cavities are created whose centres lie on a diameter AB of sphere on opposite sides of the centre.
Answer» The gravitational field at the centre of the sphere is zero The gravitational POTENTIAL at the centre remains unaffected if cavitiesare not PRESENT A circle at which all points have same potential is in the plane of diameter AB A circle at which all points have some potential is in the plane perpendicular to the diameter AB Solution :Due to symmetric mass DISTRIBUTION about centre the gravitational about centre the gravitational field at this point is equal to zero. And equipotential surface is `bot` R to the diameter AB

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In a solid sphere two small symmetrical cavities are created whose centres lie on a diameter AB of sphere on opposite sides of the centre.

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