Validating a radio button is checked with jQuery

On my form I havea set of radio buttons. Here's the mark up:

Format

When the form is submitted I want to check that one of them is checked. What's the best way to go about this? I was thinking of looping through them all and making a flag to set if one of them is checked, and then check the flag after the loop and if it's false throw an error. Any help is appreciated, cheers.

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