Gravitation Question 369

Question: A uniform ring of mass m and radius r is placed directly above a uniform sphere of mass M and of equal radius. The centre of the ring is directly above the centre of the sphere at a distance [r3] as . The gravitational field due to the ring at a distance [3r] is.

Options:

A) [Gm8r2]

B) [Gm4r2]

C) [3Gm8r2]

D) [Gm8r23]

Show Answer

Answer:

Correct Answer: C

Solution:

  • The gravitational field due to the ring at a distance [3r]

    is given by [E=Gm(3)[r2+(3r)2]3/2E=3Gm8r2]



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