AP Physics C Practice - Electricity
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AP Physics C
AP Mechanics Practice 1
AP Mechanics Practice 2
AP Mechanics Practice 3
AP Electricity Practice 1
AP Electricity Practice 2
AP Free Response 1
AP Free Response 2
AP Physics C online lectures
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Question 1: The electric potential of a region of space is given by V(x,y,z) = 2x + 3y + 1/z. Which of the following statements must be true?
The y component of the electric field in this area is constant
The z component of the electric field in this area is constant
The x component of the force experienced by an electron in this field is negative
The y component of the force experienced by an electron in this field is negative
An electron in this field will start moving parallel to the equipotential lines
Question 2: Two resistors and a capacitor are connected to a 20V source as shown below. What is the charge on each conducting plate of the capacitor?
.24mC
1mC
.2mC
.12mC
1.2mC
Question 3: Four point charges are located in free space on a circle C of radius r, as shown below. What is the magnitude of the electric field at the origin due to the four charges, if the area of the circle is A = π, and k is Coulomb's constant?
kQ
2kQ
3kQ
4kQ
5kQ
Question 4: Two charged particles enter a region with the same speed, v, as seen in the figure below. After entering the region, both particles move in the same direction. If the positive charge accelerates and the negative charge decelerates, the region could have:
an electric field oriented in direction -x and no magnetic field
an electric field oriented in direction x and no magnetic field
a magnetic field oriented in direction x and no electric field
a magnetic field oriented in direction -x and no electric field
an electric field oriented in direction y and no magnetic field
Question 5: A sphere of uniform charge density and radius R is charged with a positive charge +Q. The electric field at a R/2 distance from the sphere center is E. What is the electric field at a distance of 2R from the center?
E/4
E/3
E/2
2E/3
E
Question 6: Capacitor C
1
is created with two parallel square conducting plates of area A, dielectric of relative permitivity ε and distance between the plates d
1
= 3mm. Capacitor C
2
is created with two parallel square conducting plates of the same area A, dielectric of relative permitivity ε and distance between the plates d
2
= 1mm. If C
s
is the capacitor equivalent to C
1
in series with C
2
and C
p
is the capacitor equivalent to C
1
in parallel with C
2
, then C
s
/C
p
is equal to:
3/16
3/4
4/3
1/4
3/8
Question 7: A voltage source E is connected to four resistors as shown in the figure below. What is the value of the current that flows through the the voltage source E?
.2E/R
.4E/R
.5E/R
.6E/R
.8E/R
Question 8: A positive charge travels through a region with a magnetic field B, with a speed v, as shown above. If the force on the particle due to the magnetic field is F, which of the following orientations of the force must be true?
a
b
c
d
e
Question 9: A wire bent at a 90
o
angle carries a current i, as shown below. The magnetic field at point A:
is a function of the current i, but not a function of the distance a
is parallel to the diagonal d
must be equal to 0
is oriented into the page, pointing down
is oriented out of the page, pointing up
Question 10: A voltage source E is applied to a circuit formed by a resistor R and an inductor L connected in series. What is the current in the resistor at the time t = L/R after the switch S
1
is closed?
(E/L)/R
(E/R)/L
(E/R)/(1-e)
(E/R)/(1-1/e)
E/R
Press the Submit button to see the results.