Download Worksheet for Final Exam Review

Leader:
Course:
Instructor:
Date:
Final Exam Review
Supplemental Instruction
Iowa State University
Young
Phys 222
Dr. Soeren Prell
4/27/2015
Main Activity – Practice Final Exam
Please work individually in the following problems. You can use the equation sheet as needed
but avoid using your notes
1) A wire carries a current of 1.5A in the positive x direction and another wire carries a
current of 0.6A in the positive y direction. Select at which if the following points the net
magnetic is zero:
a) (2, 3)
b) (-1, -1)
c) (-1, 1.5)
d) (2, 3.5)
e) (-2, -5)
2) Two penguins are swimming at a depth of 6.5m in a clear Antarctic day. When the first
penguin looks up, glancing right in between he and his friend, he sees a copy of his friend
penguin looking at him from above the sea surface. If, for sea water, n = 1.35, what is the
minimum separation between the penguins so that this phenomenon can happen?
a) 4.81 m
b) 14.3 m
c) 9.63 m
d) 7.17 m
e) This is not physically possible
3) A point charge of -1.5mC is located to the right of a long vertical rod with a linear charge
density of +2.1mC/m. Select which is the correct option regarding the points at which the
electric field could be zero:
I.
Between the charge and the rod
II.
To the right of the charge
III.
The E-field won’t be zero at any point
IV.
To the left of the rod
a)
b)
c)
d)
e)
Only option III
Options II and IV
Options I and II
Only option I
Options I and IV
4) The distance between the first two dark fringes on a two-slit experiment is L0. If the
wavelength of the light is halved and the slit separation is decreased by a third, the new
separation between dark fringes will be:
a) 0.5 L0
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b)
c)
d)
e)
0.66 L0
L0 (no change)
1.5 L0
2 L0
5) A combination of two resistors (5Ω and 15Ω) in parallel is connected to a battery of 20V
and internal resistance of 1.5Ω. Determine the current through the 15Ω resistor:
a) 21.429 A
b) 3.810 A
c) 0.952 A
d) 2.857 A
e) 1.240 A
6) A proton moves in a uniform magnetic field with a velocity v. A deuterium nucleus
(made up by a proton and neutron, assume mn = mp) is moving with a velocity 1.5v. If the
frequency of revolution of the proton is f0, what is the frequency of the deuterium
nucleus? Hint: Remember f = 2π/τ, where τ is the period, time to complete one revolution
a) 2f0
b) f0/1.5
c) 1.5f0/2
d) f0/2
e) f0
7) An LRC circuit in series is connected to a 120Vrms, 60 Hz source. The current in the
circuit has a value of Irms = 15A and leads the voltage by 34°. Find the total reactance of
the circuit, and compare the magnitudes of XL and XC:
a) 8.00 Ω and XL > XC
b) 0.125 Ω and XL > XC
c) 4.47 Ω and XL > XC
d) 8.00 Ω and XC > XL
e) 0.125 Ω and XC > XL
8) A magnet is being moved into a loop, as seen in the image to the right.
As seen from above, the direction of the induced current and the force
on the loop is:
a) CCW, force upwards
b) CW, force downwards
c) CCW, no net force
d) CW, force upwards
e) CW, no net force
9) A converging lens with a focal length of 6.5cm is located 15cm away from a screen. At
what distance should the object be placed so that the image appears on the screen? What
would the magnification be?
a) At a distance of 11.47cm, with magnification of 0.76
b) At a distance of 4.53cm, with magnification of -3.31
c) At a distance of 11.47cm, with magnification of -1.31
d) At a distance of 4.53cm, with magnification of 0.30
e) You need to know the height of the object
10) As you watch a thin car oil film in a rainy day (oil on top of
water, noil = 1.55, nwater = 1.33), what color would you most
likely see if the film is 84nm thick?
a) Blue
b) Orange
c) Green
d) You will see a rainbow (multiple colors)
e) It is outside the visible light range
11) The Poynting’s vector for a flat EM wave is S(y,t) = C1 Cos2(ky+wt). Determine the
possible directions of the E and B field
a) E = -x, B = +z
b) E = +x, B = +y
c) E = +y, B = +z
d) E = +x, B = +z
e) E = +x, B = -z