Which of the following does NOT affect the strength of an electromagnet? A. number of times the wire is looped around the core
B. size of the object being attracted by the core
C. type of material in the core
D. amount of material in the core

Aflute player hears four beats per second when she compares her note to a 523 hz tuning fork (the note c). she can match the frequency of the tuning fork by pulling out the “tuning join” to lengthen her flute slightly. what was her initial frequency?