What happens if a magic item gets broken? Do they lose their magic power?
The easiest example is a wand. For example, a wand is broken into two. Can the top half be used to cast the spell? Or do the characters need to bring it to a "magic shop" to get it repaired?
I'm asking about magic items in general. For this question I'm particularly interested in wands and weapons, but will appreciate a more general guidance on treating broken magic items.