Final answer:
The appropriate tool to flare the end of a piece of electrical conduit is a brace with a ream.
Step-by-step explanation:
The tool that would be used to flare the end of a piece of electrical conduit to create a coupling with another piece of electrical conduit is a brace with a ream.
A brace with a ream is a specialized tool designed for enlarging or rounding out the end of a pipe or tube. It is commonly used by electricians and plumbers to create smooth and uniform connections between conduit sections.
Other tools like a power drill or socket wrenches could be helpful in other aspects of electrical work, but for flaring the end of conduit, a brace with a ream is the appropriate tool.