1.年級：大學
2.科目：物理
3.章節：電磁感應
4.題目：
A simple generator has 480 square coils with a side of 22.0cm.
How fast does the coil in a magnectic field(0.55T) have to rotate to produce
a voltage at a amplitude of 120V.
(正解: 1.49轉/秒)
5.想法：
http://imgur.com/a/rXLmZ
算出來跟答案不一樣, 而且好像也不是差"根號2"倍
有點沒頭緒了, 還請各位物理高手給個提示~
感謝!