t0 |
2 |
t0 |
2 |
t0 |
2 |
qE |
m |
1 |
2 |
t0 |
2 |
U |
2R |
4R |
t0 |
8R2B |
t0 |
qE |
m |
2R |
t |
|
2 |
4
| ||
t0 |
2 |
1 |
2 |
qE |
m |
t0 |
2 |
qE |
m |
qv0B |
m |
8R | ||
|
v2 |
r |
2(
| ||
t0 |
2(
| ||
t0 |
8R2B |
t0 |
4
| ||
t0 |
2(
| ||
t0 |
A. | B. | C. | D. |
A.带电粒子在a点的加速度小于带电粒子在b点的加速度 |
B.负点电荷一定位于M点左侧 |
C.带电粒子从a到b过程中动能逐渐减小 |
D.带电粒子在a点时的电势能小于带电粒子在b点时的电势能 |
A.
| B.
| C.
| D.
|
q |
m |
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