I discovered yesterday that when my Mac Book is plugged in and near the telephone at work, people on the call hear a buzzing noise. If I move the laptop away from the telephone, the buzzing goes away. If I touch the laptop while it is away from the telephone, the buzzing returns. Last, if I unplug the laptop and run on battery there is no buzzing in any circumstance.
Any guesses on whether this is a problem with my power brick or my laptop or...is this expected behavior?