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Choose the correct alternative : (a) I...

Choose the correct alternative :
(a) If the gravitational potential energy of two mass points infinite distance away is taken to be zero, the gravitational potential energy of a galaxy is (positive /negative/zero).
(b) The universe on the large is shaped by (gravitational/electromagentic) forces, on the atomic scale by (gravitational/electromagnetic) forces, on the nuclear scale by (gravitational/electromagnetic/strongnuclear) forces.

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(a) negative (b) gravitational, electromagnetic, strong nuclear.
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