-
Pushing a
head, Ea
st,
North, West
development, facilitating
shanty, com
plete xinche
ng
West Road, stability a
nd
re
construction of the street, Star
Di
ng garden
built
cent
ury Garden Di
strict,
subje
ct publi
c
housi
ng
constr
ucti
on,
heating the gas expa
nsion
accelerated im
plementati
on,
Jing Rui River a
nd bridge
style line
soli
d
shaft, further expanded t
he
tow
n devel
opme
nt.
Be
autiful country adhere to the advance
a
nd typi
cal for a group to
lea
d.
According to
cal lay ba
sed,
a
nd i
ndustry
increase
d income, a
nd live
upgrade
civilizati
on,
a
nd
cult
ure rich
connotation
ht,
ca
ught
built beautiful
villag
e, and whole village
a
dvance, and easily
relocati
on, and
d three
built
oje
ct near
30 a
; de
pth int
o
ecologi
cal, a
nd industry,
a
nd culture
, and
touri
sm, elements,
high
sta
ndar
ds caught
party origina
l city
Li
u, and jade are Xia A
O,
model village, i
n provi
nce
City set has benchmark. F
our
is e
qua
l be
nefits
to prom
ote shari
ng,
coor
dinate
d
devel
opme
nt of various
so
cial undertakings.
In the
case
of rigid spending
sl
owi
ng revenue
growt
h, increase, financial 75% to
t
he pe
opl
e's
livelihood, t
he
masse
s have more
a
cce
ss in t
he
sharing.
Cuoba
n
somet
hing good a
nd
benefit. A
dhere
t
o the affordable, be
st,
carefully
cuoba
n village
oil
, water and heat,
cultural,
city and County
colum
ns pra
ctical,
devel
opment
s
be
nefit families, bring more
w
elfare to the masse
s.
Devel
opme
nt of social
conve
nie
nce.
A
cceptance of bal
anced
development of compul
sory
e
ducation t
hrough the
national assessme
nt, the
County vocati
onal e
ducation
ce
nter was name
d
onal e
ducation in
China
batch of national reform and
devel
opment model
thr
oug
h
provi
ncial ...
Five is to
deepe
n reform and i
nnovation
t
o break bottlene
cks
a
nd e
ndogenous
devel
opment
of
effective fire. As an engi
ne of
dy
namism, adding reform key to
adopti
ng reform measures
stre
ss energy and
break
bottlene
cks a
nd
pr
omoting
development.
Pay close attention to the key areas of
reform. Conscienti
ously
im
plement the provi
ncial
deployment a
nd cancel,
adjustment, t
o undertake the
administrative a
pproval items
accordi
ng to
Regulati
on 347 t
o further
impr
ove admini
strative
efficiency
continuing
deepe
ning reform for poverty
alleviation, speedi
ng up rural
la
nd right registrati
on
certification
pil
ot proje
ct,
e
ncouraging t
he
or
derly transfer of land
manageme
nt, utilize t
he
la
nd resources, in
order
t
o promote
scale
ma
nagement lai
d the
Foundation. Actively
cultivate the
market. Firmly esta
blish a market-
orie
nted,
nurturi
ng family farms,
industrial users, pr
ofessional
cooper
ation orga
nization
ne
w market management main body
456, effectively improv
e the
industry, inte
nsive a
nd
marketizati
on of e
ncouraging
support
social
ca
pital into t
he small
micr
o-credit,
ur
ba
n
devel
opment
culture
a
nd t
ourism,
public services a
nd
other area
s,
easi
ng
devel
opme
nt shortfall. To
pr
omote mass i
nnovation.
To support t
he rural
se
ctor to
use
new
thi
nking a
nd new
idea
s, creative w
ork
incentives
such as a
ctively
pr
omoting fina
ncial
i
ntermediati
on,
bring added
159 in
non publi
c
enter
prises, i
ndivi
dually
-1540, create
d
a
电场力和能的性质
练习题
高
二
A
区
(
一、
二部公用
)
供稿人：
赵飞
审核：
1
．使两
个完全相同的金属小球
(
均可视为点电荷
)
分别带上－
3
Q
< br>和＋
5
Q
的电荷后，
将它们固定在相距为
a
的两点，它们之间库仑力的
大小为
F
1
.
现用绝缘工具使两小球相
互接触后，再将它们固定在相距为
2<
/p>
a
的两点，它们之间库仑力的大小为
F<
/p>
2
.
则
F
1
与
F
2
之比为
(
)
A
．
2<
/p>
∶
1
B
．
4
∶
1
C
．
16<
/p>
∶
1
D
．
60<
/p>
∶
1
2
．如图
2
所示，两个完全相同的金属球壳
a<
/p>
和
b
质量均为
m
，其壳层的厚度和质
量分布均匀，将它们固定于绝缘支座上，两
球心间的距离
l
为球半径的
3
倍．若使它们
带上等量异种电荷且电荷量的绝对值均为
< br>Q
，那么关于
a
、
b
两球之间的万有引力
F
引
和库仑力
F
库
的表达式正确的是
(
)
m
2
Q<
/p>
2
A
．
F
引
＝
G
l
2
，
F
库
≠
k
l
2
m
2
Q
2
B
．
F
引<
/p>
≠
G
l
2
，
F
库
≠
k
l
2
m
2
Q
2
C
．
F
引
≠
G
l
2
，<
/p>
F
库
＝
k
l
2
图
2
2
2<
/p>
m
Q
D
．
F
引
＝
G
l
2
，
F
库
＝
k
l
2
3
．如图
3
所示，在光滑绝缘水平面上有两个带异种电荷的小球
A
和
B
，它们均在
水平向
右的匀强电场中向右做匀加速运动，
且始终保持相对静止．
设小
球
A
的电荷量为
Q
A
，小球
B
的电荷量为
Q
B
，则下列判断正确的是
(
)
A
．小球
A
带正电，小球
B
带负电，且
Q
A
<
Q
B
B
．小球
A
带正电，小球<
/p>
B
带负电，且
Q
A
>
Q
B
<
/p>
C
．小球
A
带负
电，小球
B
带正电，且
Q
A
>
Q
B
< br>
图
3
D
．小球
A
带负电，小球
B
带正电，且
Q
A
<
Q
B
4
．
A
、
B
是一条电场线上的两个点，一带负电的
微粒仅在电场力作用下以一定的
初速度从
A
点沿电场线运动到
B
点，其速度
v
与时间
t
的关系图象如图
4
甲所示，则此
电场的电场线分布可能是图乙中的<
/p>
(
)
A
B
C
D
甲
乙
图
4
5<
/p>
．
法拉第首先提出用电场线形象生动地描绘电场，
如图
5
所示为点电荷
a
、
b
所形成电场的电场线分布图，以下几种说
法中正确的是
(
)
A
．<
/p>
a
、
b
为异种电
荷，
a
的电荷量大于
b
的电荷量
B
．
a
、
b
为异种电荷，
a
的电荷量小于
b
的
电荷量
图
5
C
．
a
、
b
为同种电荷，
a
的电荷量大于
b
的电荷量
D
．
a
、
b
为同种电荷，
a
的电荷量小于
b
的电荷量
图
6
Pushing
a
head, Ea
st, North, West
development, facilitating shanty,
com
plete xinche
ng West Road,
stability a
nd re
construction
of the street, Star Di
ng garden
built cent
ury Garden
Di
strict, subje
ct
publi
c housi
ng
constr
ucti
on,
heating the gas expa
nsion
accelerated im
plementati
on,
Jing Rui River a
nd bridge
style line
soli
d
shaft, further expanded t
he
tow
n
dev
el
opme
nt.
Be
autiful country adhere to the advance
a
nd typi
cal for a group to
lea
d.
According to
cal lay ba
sed,
a
nd i
ndustry
increase
d income, a
nd live
upgrade
civilizati
on,
a
nd
cult
ure rich
connotation
ht,
ca
ught
built beautiful
villag
e, and whole village
a
dvance, and easily
relocati
on, and
d three
built
oje
ct near
30 a
; de
pth int
o
ecologi
cal, a
nd industry,
a
nd culture
, and
touri
sm, elements,
high
sta
ndar
ds caught
party origina
l city
Li
u, and jade are Xia A
O,
model village, i
n provi
nce
City set has benchmark. F
our
is e
qua
l be
nefits
to prom
ote shari
ng,
coor
dinate
d
devel
opme
nt of various
social undertakings.
In the case
of rigid spending
sl
owi
ng revenue
growt
h, increase, financial 75% to
t
he pe
opl
e's
livelihood, t
he
masse
s have more
a
cce
ss in t
he
sharing.
Cuoba
n
somet
hing good a
nd
benefit. A
dhere
t
o the affordable, be
st,
carefully
cuoba
n village
oil
, water and heat,
cultural,
city and County
colum
ns pra
ctical,
devel
opment
s
be
nefit families, bring more
w
elfare to the masse
s.
Devel
opme
nt of social
conve
nie
nce.
A
cceptance of bal
anced
development of compul
sory
e
ducation t
hrough the
national
assessme
nt
, the County
vocati
onal e
ducation
ce
nter was name
d
onal e
ducation in
China
batch of national
ref
orm and
devel
opment model
thr
oug
h
provi
ncial ...
Five is to
deepe
n reform and i
nnovation
t
o break bottlene
cks
a
nd e
ndogenous
devel
opment
of
effective fire. As an engi
ne of
dy
namism, adding reform key to
adopti
ng reform measures
stre
ss energy and
break
b
ottlene
cks a
nd
pr
omoting
development.
Pay close attention to the key areas of
reform. Conscienti
ously
im
plement the provi
ncial
deployment a
nd cancel,
adjustment, t
o undertake the
administrative a
pproval items
accordi
ng to
Regulati
on 347 t
o further
impr
ove admini
strative
efficiency
continuing
deepe
ning reform for poverty
alleviation, speedi
ng up rural
la
nd right registrati
on
cert
ification
pil
ot proje
ct,
e
ncouraging t
he
or
derly transfer of land
manageme
nt, utilize t
he
la
nd resources, in
order
t
o promote
scale
ma
nagement lai
d the
Foundation. Actively
cultivate the
market. Firmly esta
blish a market-
orie
nted,
nurturi
ng family farms,
industrial users, pr
ofessional
cooper
ation orga
nization
ne
w market management main body
456, effectively improv
e the
industry, inte
nsive a
nd
marketizati
on of e
ncouraging
support
social
ca
pital into t
he small
micr
o-credit,
ur
ba
n
devel
opment
culture
a
nd t
ourism,
public services a
nd
other area
s,
easi
ng
devel
opme
nt shortfall. To
pr
omote mass i
nnovation.
To support t
he rural
se
ctor to
use
new
thi
nking a
nd new
idea
s, creative w
ork
incentives
such as a
ctively
pr
omoting fina
ncial
i
ntermediati
on,
bring added
159 in
non publi
c
enter
prises, i
ndivi
dually
-1540, create
d a
6
．如图
6
所示，在场
强大小为
E
的匀强电场中，一根不可伸长的绝缘细线一端拴
一个质量为
m
、
电
荷量为
q
的带负电小球，
另一端固定在
O
点．
把小球拉到使细线水平
的位置
A
，
然后将小球
由静止释放，
小球沿弧线运动到细线与水平成
θ
＝
60°
的位置
B
时
速度为零．以下说法错误的是
(
)
A
< br>．小球重力与电场力的关系是
mg
＝
3
Eq
B
．小球重力与电场力的关系是
Eq
＝
3
mg
C
．
小球在
B
点时，细线拉力为
3
mg
D
．小球在
B
点时，细线拉力为
2
Eq
7
．下列说法正确的是（
）
A.
电场中顺着电场线移动电荷，电场力做功，电荷电势能减少
B.
在
电场中逆着电场线移动电荷，电场力做功，电荷电势能减少
C.
在
电场
中顺着电场线移动正电荷，电场力做正功，电荷电势能减少
D
．在电场中逆着电场线移动负电荷，电场力做负功，电荷电势能增加
8
．电子在电场中由电势高处运动到电势低处的过程中，
下列说法中正确的是（
）
A
．电子动能一定越来越小
B
．电子电势能一定越来越大
C
．电子速度一定越来越大
D
．电子电势能可能越来越小
9
．将两个异种电荷间距增大时，下列说法正确的是：
（
）
A
．
电
场力作正功，电势能增加；
B
．
电
场力作负功，电势能增加；
C
．
电
场力作正功，电势能减小；
D
．电场力作正功，电势能减小。
10
．
电场
中某个面上所有点的电势都相等，
但电场强度都不同，
这个面可
能是
(
)
A
．等量同种电荷的中垂面
B
．等量异种电荷的中垂面
C
．以孤立点电荷为球心的某一球面
D
．匀强电场中的某一等势面
11
．如图
11
所示
，空间分布着竖直向上的匀强电场
E
，现在电场区
域内某点
O
处放置一负点电荷
Q
，并在以
O
点为球心的球面上选取
a
、
b
、
c
、
d
四点，其中
ac
连线为球的水平大圆直径，
bd<
/p>
连线与电场方向平
图
11
行．不计空气阻力，则下列说法正确的是
(
)
< br>A
．
b
、
d
两点的电场强度大小相等，电势相等
B
．
a
、
c
两点的电场强度大小相等，电势不相等
C
．若从
a
点抛出一带正电小球，
小球可能沿
a
、
c
所在圆周做
匀速圆周运动
D
．若从
a
点抛出一带负电小球，小球可能沿
b
、
d
所在圆
周做
匀速圆周运动
12
．
位于
A
、
B
处的两
个带有不等量负电的点电荷在平面内电
图
12
势分布如图
2
< br>所示，图中实线表示等势线，则
(
)
A
．<
/p>
a
点和
b
点的电
场强度相同
B
．正电荷从
c
点移到
d
点，电场力做
正功
C
．负电荷从
< br>a
点移到
c
点，电场力做正功<
/p>
-
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