There are four basic forces in nature: gravity, the electromagnetic force, the strong nuclear force, and the weak nuclear force. of the four basic forces which acts over the shortest distance? a gravity b electromagnet force c strong nuclear force d weak nuclear force

D. Weak Nuclear Force.

Weak Force is named thus because it is weak compared to the Strong Force. However, it is responsible for holding particles that are smaller than a Proton. Hence, this is the force that acts over the shortest distance, typically of the order of , which is much less than the diameter of a proton.

there are no contact forces mentioned on the list of choices that you've provided.