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Static electricity and e-fields

Total questions: 20

Worksheet time: 13mins

Name
Class
Date
1.
In a neutral atom, the number of electrons is equal to the number of _______.
a)
Neutrons
b)
Orbits
c)
Protons
d)
subatomic particles
2.
If two charges repel each other, the two charges must be
a)
Positive and neutra
b)
Positive and negative
c)
positive and neutral
d)
negative and negative
3.
If you rub a glass rod with a piece of silk, the rod becomes positively charged. This means that
a)
friction destroyed electrons in the rod.
b)
the silk has become negatively charged.
c)
protons have moved to the rod.
d)
glass attracts more protons.
4.
If you bring a charged object near an electrically neutral surface without allowing the object to touch the surface, the charges in the surface are rearranged by
a)
friction.
b)
convection.
c)
induction.
d)
conduction.
5.
Objects that have opposite charges
a)
are attracted to each other, and the force between the objects pulls them together.
b)
are attracted to each other, and the force between the objects pushes them apart.
c)
are repelled by each other, and the force between the objects pulls them together.
d)
are repelled by each other, and the force between the objects pushes them apart.  
6.
A region around a charged particle that can exert a force on another charged particle is called an
a)
electric pulse.
b)
electric charge.
c)
electric force.
d)
electric field.
7.
Charging by ____ occurs when electrons are transferred from one object to another by direct contact.
a)
reduction
b)
induction
c)
conduction
d)
friction
8.
Force between two bodies having charges 5.0 x 102 μC and 1.0 x 102 μC separated by distance of 0.50 m in air is
a)
1800 N
b)
1.0 x 103 N
c)
2200 N
d)
3.0 x 102 N
9.
A positive charge of 4.0 µC exerts an attractive force of 8.0 N on an unknown charge 20.0 cm away. The unknown charge is
a)
+ 8.9 µC 
b)
- 8.9 µC
c)
+ 4  µC
d)
- 44  µC 
10.
Which part of Coulomb's Law is always squared?
a)
distance
b)
charge
c)
Coulomb's constant
d)
force
11.
At which point is the electric field the strongest
a)
A
b)
B
c)
C
d)
D
12.
At which point is the electric field the weakest?
a)
A because it is the furthest away
b)
A because the field lines are further apart
c)
C because the field lines are further apart
d)
C  because it is the furthest away
13.
QA and QB are two charges creating an electric field. Based on the electric field lines, we can conclude
a)
QA and QB are both positive
b)
QA and QB are both negative
c)
QA is positive and QB is negative
d)
QA is negative and QB is positive
14.

Which of the following is a true statement about the electric field between the two plates?

a)

The field is attractive between the plates and uniform in strength

b)

The field is repulsive between the plates and uniform in strength

c)

The field is attractive between the plates and strongest near the positive

d)

The field is repulsive between the plates and strongest near the positive

15.

Which diagram correctly shows the electric field around a negative charge?

a)

A

b)

B

c)

they are both positive

16.
The electric field surrounding a positively charged object is
a)
Away from the charge
b)
Toward the charge
17.

An atom of oxygen has 8 protons and 10 electrons, this means the atom is ____________

a)

positively charged because it has excess electrons

b)

negatively charged because it has excess electrons

c)

positively charged because it has a deficiency of electrons

d)

negatively charged because it has a deficiency of electrons

18.

Coulomb's law also says if distance increases, then force

a)

decreases

b)

disapears

c)

destroyed in a heartbeat

d)

doubles

19.
How do electric field lines represent the magnitude of an electric field?
a)
Length of the line
b)
With arrows
c)
Density of lines
d)
Width of lines
20.
In the diagram below, P is a point near a negatively charged sphere. Which direction best represents the direction of the electric field at point P?
a)
Right
b)
Left
c)
Up 
d)
Down

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