Download Questions For Physics 2A

11/14/12
Questions For Physics 2A
Questions For Physics 2A
This File Contains some American Questions for Physics 2A
Topics Are:
Electric Fields
Flux and Gauss Law
Electric Potentials
Capacitance
Electric Field
problem 1
The diagrams below depict four different charge distributions. The charged particles are all the same distance from the origin.
The electric Field at the origin:
A.
B.
C.
D.
E.
is greatest for situation 1
is greatest for situation 3
is zero for situation 4
is downward for situation 1
is downward for situation 3
problem 2
Positive charge +Q is uniformly distributed on the upper half of a semicircular rod and negative charge -Q is uniformly
distributed on the lower half. What is the direction of the electric Field at point P, the center of the semicircle?
A.
B.
C.
D.
←
→
↑
↓
problem 3
Two point particles, with charges of q1 and q2, are placed a distance r apart.The electric Field is zero at a point P between the
particles on the line segment connecting them. We conclude that:
A. q1 and q2 musthavethesamemagnitudeandsign
B. P must be midway between the particles
C. q1 and q2 must have the same sign but may have different magnitudes
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D. q1 and q2 must have equal magnitudes and opposite signs
E. q1 and q2 must have opposite signs and may have different magnitudes
Flux and Gauss Law
problem 4
The flux of the electric Field
A.
B.
C.
D.
E.
through a
portion of the yz plane in
32
34
42
48
60
problem 5
A particle with charge 5.0 μC is placed at the corner of a cube. The total electric flux in
A.
B.
C.
D.
E.
through all sides of the cube is:
0
71000
94000
140000
560000
problem 6
Which of the following graphs represents the magnitude of the electric Field as a function of the distance from the center of a
solid charged conducting sphere of radius R?
problem 7
Charge Q is distributed uniformly throughout an insulating sphere of radius R. The magnitude of the electric field at a point
r=R/2 from the center is
A.
B.
C.
D.
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E. none of the above
Electric Potential
problem 8
A particle with mass m and charge -q is projected with speed v0 into the region between two parallel plates as shown. The
potential difference between the two plates is V and their separation is d. The change in kinetic energy of the particle as it
traverses this region is:
A.
B.
C.
D.
E. none of the above
problem 9
An electron goes from one equipotential surface to another along one of the four paths shown below. Rank the paths according
to the work done by the electric field, from least to greatest
A.
B.
C.
D.
E.
1,2,3,4
4,3,2,1
1,3, 4 and 2 same
4 and 2 same,3,1
4,3,1,2
problem 10
A total charge of 7X10^(-8) C is uniformly distributed throughout a non-conducting sphere with a radius of 5 cm. The electric
potential at the surface, relative to the potential far away, is about:
A.
B.
C.
D.
E.
-1.3X10^4
1.3X10^4
7X10^5
-6.5X10^4
0
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problem 11
If the electric field is in the positive x direction and has a magnitude given by E = Cx2, where C is a constant, then the electric
potential is given by V =:
A.
B.
C.
D.
E.
problem 12
Three possible configurations for an electron e and a proton p are shown below. Take the zero of potential to be at infinity and
rank the three configurations according to the potential at S, from most negative to most positive.
A.
B.
C.
D.
E.
1, 2, 3
3, 2, 1
2, 3, 1
1 and 2 tie, then 3
1 and 3 tie, then 2
Capacitance
problem 13
The capacitance of a parallel-plate capacitor can be increased by:
A.
B.
C.
D.
E.
increasing the charge
decreasing the charge
increasing the plate separation
decreasing the plate separation
decreasing the plate area
problem 14
Each of the four capacitors shown is 500 μF. The voltmeter reads 1000V. The magnitude of the charge, in coulombs, on each
capacitor plate is:
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A.
B.
C.
D.
E.
0.2
0.5
20
50
none of the above
problem 15
A 2 μF and a μF capacitor are connected in series and charged by a battery. They store energies P and Q, respectively. When
disconnected and charged separately using the same battery, they store energies R and S, respectively. Then:
A.
B.
C.
D.
E.
R>P>S>Q
P>Q>R>S
R>P>Q>S
P>R>S>Q
R>S>Q>P
Solutions
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
C
D
C
D
B
E
D
C
D
B
D
D
D
B
E
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