π |
2 |
Em |
R+r |
Im | ||
|
Im | ||
|
6.28 | ||
|
. |
I |
. |
I |
| ||
R+r |
. |
E |
△Φ |
△t |
△Φ |
R+r |
0.05×0.22 |
2+8 |
π |
2 |
A.瞬时表达式为e=NBSωsinωt | ||||
B.有效值为
| ||||
C.平均值为
| ||||
D.频率为2πω |
A.400V,0.02s | B.200V,0.02s | C.400V,0.08s | D.200V,0.08s |
A.t=0时线圈的感应电动势为零 | ||
B.转过90°时线圈的感应电动势最大 | ||
C.转过90°的过程中线圈中的平均感应电动势为
| ||
D.转过90°的过程中线圈中的平均感应电动势为
|
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