Supplemental Instruction
Iowa State University / Leader: / German Parada
Course: / Phys 222
Instructor: / Dr. Soeren Prell
Date: / 5/4/2014
Introduction activity
1)Please write in the note card provided any questions you may have for me to answer. The more specific, the better.
2)Complete the following crossword puzzle (just for the fun of it :)
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:
- Between the charge and the rod
- To the right of the charge
- The E-field won’t be zero at any point
- To the left of the rod
a)Only option III
b)Options II and IV
c)Options I and II
d)Only option I
e)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
b)0.66 L0
c)L0(no change)
d)1.5 L0
e)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 thecircuit, and compare the magnitudes of XL and XC:
a)8.00Ω 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