Answer:
(a) The strong nuclear forces operate only over a range of distance of the order of \[{{10}^{-14}}\] to \[{{10}^{-15}}m.\]. The forces involved in weak interactions operate only during radioactive decay. Electrical forces are stronger than gravitational forces for a given distance, but they can be attractive as well as repulsive unlike gravitational force, which is always attractive. As a result, the forces between massive neutral bodies are predominantly gravitational. (b) No, the forces of friction and other contact forces have electromagnetic origin.
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