Sample Exam 3
[Magnetism; Electromagnetism;
Energy Technology; Light]
1/ As the proton moves toward the point O it will be deflected by a magnetic force…
(A) toward the S pole of the magnet.
(B) toward the N pole of the magnet.
(C) vertically upward.
(D) vertically downward.
2/ The proton moves on a circle in the magnetic field B. (The field points into the page – away from you.) The proton speed is 3 ´ 106 m/s and the radius of the circle is 10 cm = 0.1 m. Calculate the strength of the magnetic field.
(A) 0.31 T (B) 0.42 T
(C) 0.53 T (D) 0.64 T
3/ Which philosopher of ancient
(A) Chratos (B) Archimedes (C) Eudoxes
(D) Thales (E) Aristotle
4/ Each wire segment (see figure) has length 0.5 m and carries current I = 20 A. The wires are separated by distance D = 2 cm = 0.02 m. What is the force on either wire?
(A) 1.0 × 10-3 N (B) 2.0 × 10-3 N
(C) 2.5 × 10-3 N (D) 4.0 × 10-3 N
5/ The long straight wire above carries current I toward the right. In what direction is the magnetic field B at the point P?
(A) toward the top of the page
(B) toward the bottom of the page
(C) out of the page (toward you)
(D) into the page (away from you)
(E) up toward the top of the page
6/ Refer again to the figure in Question 5. Suppose the current is 3 A and the distance D is 5 cm. Calculate the magnetic field strength at P.
(A) 1.2 × 10-3 T (B) 2.0 × 10-5 T
(C) 2.0 × 10-3 T (D) 1.2 × 10-5 T
7/ The magnet (see figure) moves from position A to position B in 0.3 seconds. As a result, the magnetic flux through the surface S increases from
4.0 ´ 10-3 Tm2
to 11.0 ´ 10-3 Tm2. Calculate the electromotive force around the square as the magnet moves from A to B.
(A) 1.67 × 10-3 volts (B) 2.33 × 10-2 volts
(C) 1.67 × 10-3 watts (D) 2.33 × 10-2 watts
8/ Faraday and Henry discovered electromagnetic induction, independently. Which year?
(A) 1812 (B) 1831 (C) 1855
(D) 1862 (E) 1886
9/ Historically, the technology of alternating current (AC) electricity came from the genius of
(A)
(D) Tesla (E) Westinghouse
10/ The first oil wells in
(A) geological processes deep underground.
(B) ancient plant life.
(C) dinosaurs.
(D) ancient microscopic marine life.
(E) liquefying hydrocarbon minerals.
11/ Petroleum and natural gas are very rare in the geology of Michigan (MI). Which answer explains this statement?
(A) Dinosaur fossils do not occur in MI.
(B) Hot geological processes do not occur in MI.
(C) The statement is false – oil and gas are not rare in MI.
(D) MI is continental not marine.
12/ A power transformer has input emf of 13,800 volts ( = RMS emf of the alternating current) and an output emf of 400 volts (RMS). The number of turns of wire in the input and output coils may be
(A) 3450 (in) and 100 (out)
(B) 100 (in) and 3450 (out)
(C) 2860 (in) and 50 (out)
(D) 50 (in) and 2860 (out)
13/ The distance from the Earth to the Moon is
3.84 x 108 m. What is the time for a radio signal to travel from an astronaut on the Moon to the Earth?
(A) less than 1 second
(B) approximately 1 second
(C) approximately 10 seconds
(D) approximately 1 minute
(E) not enough information is given because it depends on the frequency of the radio waves.
14/ A beam of light is incident from vacuum onto a smooth glass surface. The angle of incidence is 45 degrees and the angle of refraction is 30 degrees, as shown. Determine the speed of light in the glass. (c = speed of light in vacuum)
(A) 0.7 c (B) 0.8 c (C) 0.9 c
(D) c (E) 1.1 c
15/ Looking at a CD surface in white light, we can see the rainbow spectrum. Which optical phenomenon produces the colors? (Choose the best answer.)
(A) Prismatic reflection
(B) Dispersion
(C) Constructive interference
(D) Destructive interference
(E) Chromatic aberration
16/ What is light? (Choose the best answer.)
(A) An electrical wave
(B) A stream of electrical particles
(C) Pure energy
(D) Propagating electric and magnetic fields
(E) All of the above