U |
d |
mgd |
q |
q
| ||
m |
qU1-mgd |
md |
d |
2 |
1 |
2 |
1 |
2 |
qU1-mgd |
md |
m
| ||
qL2 |
mgd |
q |
mgd-qU2 |
md |
d |
2 |
1 |
2 |
1 |
2 |
mgd-qU2 |
md |
mgd |
q |
m
| ||
qL2 |
mgd |
q |
m
| ||
qL2 |
m
| ||
qL2 |
mgd |
q |
d |
2 |
1 |
2 |
| ||
L2 |
m
| ||
L2 |
d |
2 |
1 |
2 |
1 |
2 |
v | 20 |
1+
|
mgd |
q |
mgd |
q |
m
| ||
qL2 |
m
| ||
qL2 |
mgd |
q |
1+
|
A.电场力与重力大小相等 |
B.粒子运动的水平位移大小等于竖直位移大小 |
C.电场力所做的功一定等于克服重力所做的功 |
D.电势能的减少一定大于重力势能的增加 |
A.VA:VB=2:1 | B.VA:VB=2:3 | C.VA:VB=3:1 | D.VA:VB=3:2 |
© 2017-2019 超级试练试题库,All Rights Reserved.