As a camera flash charges up, one hears a whirr of increasing pitch.
What causes this? Is there enough stray inductance to cause some
oscillation and hence mechanical stress via a magnetic interaction
(vaguely light-bulb filament style)?
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Carl E. Mungan, Asst. Prof. of Physics 410-293-6680 (O) -3729 (F)
U.S. Naval Academy, Stop 9C, Annapolis, MD 21402-5026
mungan@usna.edu http://physics.usna.edu/physics/faculty/mungan/