While certainly not my reference of choice...from Wikipedia:
A rhetorical question is a figure of speech in the form of a question posed for its persuasive effect without the expectation of a reply (ex: "Why me?") Rhetorical questions encourage the listener to think about what the (often obvious) answer to the question must be.
Having grown up surrounded by them, I suspect that as a lawyer, you already know this. *L*
.