△B |
△t |
BL2ω | ||
|
1 |
4 |
2π |
ω |
π |
2ω |
E |
R+r |
πωRB2L4 |
4(R+r)2 |
B2L2v1 |
R+r |
1 |
2 |
v | 21 |
1 |
2 |
v | 22 |
v | 21 |
| ||||
4L |
B2L2v1 |
m(R+r) |
1 |
4 |
v | 22 |
v | 21 |
πωRB2L4 |
4(R+r)2 |
| ||||
4L |
B2L2v1 |
m(R+r) |
1 |
4 |
v | 22 |
v | 21 |
|
2 |
3 |
π |
6 |
A.金属杆对小环不做功 | ||||
B.小环沿x轴方向的分运动为匀速运动 | ||||
C.小环到达金属杆的最高点时的速度为5
| ||||
D.小环到达Q=(
|
| ||
2 |
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