v2 |
r |
mv |
qB |
2πm |
qB |
60° |
360° |
2 |
2 |
A.右边界:-3cm<y<3cm有粒子射出 |
B.右边界:y>3cm和y<-3cm有粒子射出 |
C.左边界:y>6cm有粒子射出 |
D.左边界:0<y<6cm有粒子射出 |
A.速率变小,半径变小,周期不变 |
B.速率不变,半径不变,周期不变 |
C.速率变小,半径变大,周期变大 |
D.速率不变,半径变小,周期变小 |
Bqd |
m |
5 |
3 |
A.43e | B.45e | C.88e | D.90e |
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