What would happen to bitcoin in a world with no electricity/internet?
Without computers or electricity, Bitcoin would have no value and could not be used as it is entirely a digital asset. There are no such an object as a coin and thus Bitcoin cannot be put into a physical asset. The blockchain itself is what determines something is Bitcoin, and without it (because there are no computers or electricity), anything physical intended to represent or store Bitcoin (e.g. a paper wallet) has no value besides the value of the material itself.