Transcript Electrostatics Physics I Review

Electrostatics & Magnetism Review
Physics I
Electric Field lines exit __ charges and
enter ___ charges.
1.
2.
3.
4.
Neutral , negative
Negative, Positive
Positive, Negative
Positive , Neutral
What causes an object to become electrically
charged?
1. Gain or Loss of
protons
2. Gain or Loss of
electrons
3. Gain or loss of
neutrons
One of these isolated charged spheres is copper and the other
is rubber. The diagram below depicts the distribution of excess
negative charge over the surface of two spheres. Which
material is copper?
1. A
2. B
3. Neither
If the distance between two charges is doubled,
then the force of attraction or repulsion would
1.
2.
3.
4.
Double.
Quadruple
Reduce to half.
Reduce to ¼.
As shown in the diagram below, a charged rod is held
near, but does not touch a neutral electroscope. The
charge on the knob becomes
If your comb becomes negatively
charged when combing your hair
then which of the following
occurred?
1. Hair lost electrons
2. Hair gained
electrons
3. Hair lost protons
4. Hair gained protons
One object has a charge of +3 C and the other is -7 C.
What is the final charge on the objects after they
touch?
1.
2.
3.
4.
5.
6.
-4
+4
+2
-2
-10
+10
The diagram below illustrates
1. Charging by friction
2. Charging by induction
3. Charging by conduction
Where is the electric force
strongest on the test charge?
A
C++
+
+
Q
+
+
++
B
1. A
2. B
3. C
What is the resulting direction at point J of the electric
fields created by both charges?
A.
B.
C.
D.
Right
Left
Zero
Cannot be determined.
2. If you put a small compass in a magnetic
field, the compass will
a. line up in a direction parallel
to the magnetic field lines.
b. swing randomly.
c. line up in a direction
perpendicular to the
magnetic field lines.
d. seek electrical charge
concentrations.
What is the direction of the force on the
negative charge in the figure?
__
1.
2.
3.
4.
5.
6.
Up
Down
Left
Right
Into Page
Out of page
What is the direction of the force
on the positive charge?
A.
B.
C.
D.
E.
F.
Up
Down
Left
Right
Into Page
Out of page
Two identical charges of +3µC are 2 m apart.
What force do they exert on one another?
0.02 N
A charge of -5x10-5 C is 50 cm from a 3x10-5 C
charge. What magnitude of force do they exert
on one another?
54 N
Moving electric charges are
surrounded by
a. only electric fields.
b. only magnetic fields.
c. both magnetic and
electric fields.
d. nothing.
The magnetic field lines about a
current-carrying wire form
a.
b.
c.
d.
circles.
radial lines.
eddy currents.
spirals.
Which charge has the greatest field
strength?
A.
B.
C.
D.
G
H
I
All are equal
A positive charge enters the magnetic field
below. The force on the charge is down.
What is the direction of the velocity?
1.
2.
3.
4.
5.
Up
Left
Right
Out of page
Into Page
Force
A current carrying wire is placed in the
magnetic field below. What is the direction of
the force on the wire?
N
S
N
I
1.
2.
3.
4.
5.
6.
Up
Down
Left
Right
Into page
Out of page
S
The Earth’s Magnetic North is
located at
a. The South geographic pole
b. The North Geographic pole.
c. The equator.
Which diagram best illustrates the electric
field around two unlike charges?