Electromagnetic Force

Assertion (A) Electromagnetic force is enormously strong as compared to gravitational force. Yet gravity dominates in the large-scale phenomena (e.g. formation of galaxies). Reason ( R ) Existence os positive and negative charges make matter mostly electrically neutral. Which of the following is true ?

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.

A: Gravitational force is always attractive but electromagnetic force can be attractive or repulsive: R : Mass comes only in one variety (there is no negative mass) but charge comes in two varieties. (Positive and negative charge)

A: Gravitational force is always attractive but electromagnetic force can be attractive or repulsive: R : Mass comes only in one variety (there is no negative mass) but charge comes in two varieties. (Positive and negative charge)