On a guitar with two single coil pickups, the neck pickup has the inverse polarity of the bridge pickup, so that middle position (combining the two pickups) cancels out interference. There’s usually a “sweet spot” with the least amount of electrical interference - you’ll hear it when you get there. There are a few simple ways to combat this: Does the hum come back? If so, the hum could be caused by electromagnetic interference from fluorescent lights, dimmers, computer monitors, or other unshielded sources.
Plug the guitar back in and turn up the volume knob on the instrument.
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