a |
2 |
mv2 |
r |
qBa |
2m |
qBa |
2m |
a |
2 |
aqB |
2mv |
aqB |
2mv |
1 |
2 |
v | 2m |
1 |
2 |
v | 20 |
| ||
R0 |
mv0 |
qB |
qB |
m |
mvm |
qB |
v | 2m |
2E |
B |
v | 20 |
E |
B |
(
|
E |
B |
(
|
E |
B |
(
|
A.a、b均带正电 |
B.a在磁场中飞行的时间比b的短 |
C.a在磁场中飞行的路程比b的短 |
D.a在P上的落点与O点的距离比b的近 |
A.s1<s2 | B.s1=s2 |
C.t1:t2=(л-θ):θ | D.t1:t2=θ:(2л-θ) |
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