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AP Physics C Electricity and Magnetism
Question 1:
Three previously uncharged capacitors are connected to a 10V battery as shown above. What is the charge on the top plate of C
_{1}
?
+50µC
+25µC
-25µC
-50µC
0µC
Question 2:
Points A and B contain two negative point charges -Q, as shown above. What is the value of the angle between the x axis and the net electric field at origin?
60
^{o}
90
^{o}
30
^{o}
45
^{o}
145
^{o}
Question 3: A closed loop wire of resistance R and area A is placed in a horizontal plane that is situated in a magnetic field described by
B(t) = B·sin(ωt). The magnetic field is perpendicular to the horizontal plane. What is the maximum instantaneous current in the loop?
ABcos(ω)/R
ABsin(ω)/R
ABω/R
ABωR
AB/(ωR)
Question 4:
In the circuit shown above, switch S1 is closed at t = 0s. At time t
_{1}
the voltage on the capacitor C is 90% of the voltage source E. t
_{1}
=
RCln(.1)
-RCln(.1)
e
^{RC}
-RCln(10)
RCln(10)
Question 5:
The electrical potential difference V
_{A}
- V
_{A}
between points A and B is 400V. A and B are points placed on a circle of radius equal to 2m, as shown above. What is the magnitude of the uniform electric field E?
600V/m
400V/m
250V/m
200V/m
100V/m
Question 6:
In the figure above, switch S is closed at t = 0s. What is the current through resistor R
_{1}
imediately after the switch is closed?
E/(R
_{1}
+ R
_{2}
)
E/R
_{1}
0A
(E/R
_{1}
)(L
_{1}
/L
_{2}
)
E/L
_{1}
Question 7:
Wire of resistivity ρ and length l has the cross-sectional area shown above. If r
_{1}
= .001l, r
_{2}
= .002l and the resistance of the wire is k/l, then k =
ρ/(3π10
^{-6}
)
ρ/(3π10
^{3}
)
3ρ/(π10
^{-6}
)
ρπ10
^{-6}
)
ρl/(3π)
Review the AP Physics C electricity and magnetism correct answers.