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Question (11)

QN0035446

A uniform spherical shell gradually shrinks maintaining its shape. The gravitational potential at the centre

(A)
increases
(B)
remains constant
(C)
decreases
(D)
cannot say

Correct Answer: A

Explanation:

The gravitational potential at the centre of uniform spherical shell is equal to the gravitational potential at the surface of shell i.e.,

, where is radius of spherical shell

Now, if the shell shrinks then its radius decrease then density increases, but mass is constant. so from above expression if a decreases, then increases.

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Question (12)

QN0035447

The gravitational potential at the centre of a square of side ' ' and four equal masses ( each) placed at the corners of a square is

(A)
Zero
(B)
(C)
(D)

Correct Answer: C

Explanation:

Total gravitational potential at the centre of the square

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