an electromagnet can be made by wrapping wire around which object?

Brief Explanations:

An electromagnet is made by wrapping wire around a ferromagnetic core. Ferromagnetic materials like iron can be easily magnetized. The first image appears to be a non - magnetic material (possibly wood), and the second image seems to be a plastic or non - magnetic pipe. However, if we assume the options are not shown completely and we consider the principle, we need a ferromagnetic object. Iron is a common choice for the core of an electromagnet.

Answer:

Neither of the given objects are suitable as they don't seem to be ferromagnetic. A ferromagnetic object like an iron nail would be appropriate.