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PHYS 205-SECTIONS 01, EC 1 MULTIPLE CHOICE FINAL EXAMINATION DECEMBER CONCORDIA UNIVERSITY
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PHYS 205-SECTIONS 01, EC 1 MULTIPLE CHOICE FINAL EXAMINATION DECEMBER CONCORDIA UNIVERSITY
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PHYS 205-SECTIONS 01, EC 1 MULTIPLE CHOICE FINAL EXAMINATION DECEMBERCONCORDIA UNIVERSITY
1. (4 marks) Two imaginary spherical surfaces of radius R and 2R, respectively, surround a
positive point charge Q located at the center of the concentric spheres. When compared
tothe number of electric field lines N1 going through the sphere of radius R, the number
of electric field lines N2 going through the sphere of radius 2R is:
𝑁1
a) 𝑁2 = 4
𝑁1
b) 𝑁2 = 2
c) 𝑁2 = 𝑁1
d) 𝑁2 = 2𝑁1
e) 𝑁2 = 4𝑁1
2. (4 marks) A parallel-plate capacitor of capacitance C0 has plates of area A with
separation d between them. When it is connected to a battery of voltage V0, it has
charge of magnitude Q0 on its plates. The plates are pulled apart to a separation 2d
while the capacitor remains connected to the battery. After the plates are 2d apart, the
magnitude ofthe charge on the plates and the potential difference between them are:
𝑉
a) 𝑄0 , 0
2 2
b) 𝑄0 , 𝑉
2 0
c) 𝑄0, 𝑉0
d) 2𝑄0, 𝑉0
e) 2𝑄0, 2𝑉0
3. (4 marks) What is the potential difference VB − VA when I = 0.50 A in the circuit
segment shown below?
a) +28 V
b) + 2 V
, c) -28 V
d) -2 V
+18 V
4. (4 marks) Consider the AC circuit in the figure. The frequency of the AC
source is adjusted while its voltage amplitude is held constant. When
does the lightbulb glow the brightest?
a) It glows brightest at high frequencies.
b) It glows brightest at low frequencies.
c) The brightness is the same at all frequencies.
5. (4 marks) As shown in the figure, a bar magnet is dropped and
passes through a circular loop. Looking from the top, what is
thedirection of the induced current in the loop as the magnet
approaches and then when it goes away from the loop:
a) Clockwise and then counter-clockwise
b) Counter-clockwise and then clockwise
c) Clockwise in both cases
d) Counter-clockwise in both cases
e) There will be no induced current in the loop
6. (4 marks) What is the radius of curvature of the path of a 3-keV proton in a
perpendicularmagnetic field of magnitude 0.8 T?
a) 9.9 mm
b) 1.1 cm
c) 1.3 cm
d) 1.4 cm
e) 7.6 mm
7. (4 marks) An electron is moving North in a region where the magnetic field is South.
The magnetic force exerted on the electron is:
a) zero
b) up
c) North
d) East
e) West
8. (4 marks) Two long parallel straight wires carry equal currents in opposite directions. At
a point midway between the wires, the magnetic field they produce is:
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