Sample Exam 3
/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/ 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.
/11/ 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)
/12/ A race car accelerates on a straight track from speed 0 to speed 10 m/s in 3 seconds. The mass of the car is 700 kg and the mass of the driver is 50 kg. Calculate the net force on the car.
(A) 2.50 × 104 N (B) 2.33 × 104 N
(C) 2.50 × 103 N (D) 2.33 × 103 N
/13/ The curved track in the figure to the right is an arc of a circle with radius R = 3 m. The block slides without friction down the track, in Earth’s gravity, starting from rest at height H = 3 m. Calculate the speed of the block at the bottom (point F).
(A) 6.6 m/s (B) 7.7 m/s (C) 5.5 m/s (D) 8.8 m/s
/14/ The steel ball (speed = 5 m/s before the collision) hits the wood ball (speed = 0 before the collision) head on. The balls have the same size (but different mass). Compare the forces on the balls during the collision.
(A) The steel ball exerts a greater force because it has greater mass.
(B) The steel ball exerts a greater force because it is moving.
(C) The forces exerted by the two balls are equal.
(D) The wood ball exerts a greater force because it is not moving.
(E) The wood ball exerts a greater force because it has greater mass.
/15/ Suppose a comet in the Solar System revolves around the sun on an orbit with aphelion distance = 70 AU and perihelion distance = 2 AU. Then what is the period of revolution?
(A) 108 yr (B) 216 yr (C) 324 yr (D) 72 yr
/16/ As the magnet moves toward the coil of wire, a current will flow around the coil of wire. Why?
(A) An electric field is induced with directions tangent to the coil of wire.
(B) A current is induced by any flux.
(C) Current creates magnetism (Ampere’s law).
(D) Current will not flow because there is no battery.
(E) Electrons are forced by the magnetic field (Lorentz force).
/17/ Two long parallel wires carry equal currents, I = 5 A, in opposite directions. The distance between the wires is d = 1 cm. Calculate the magnetic field at point P (half way between the wires).
(A) 4.0 × 10-4 T (B) 6.0 × 10-4 T
(C) 4.0 × 10-3 T (D) 6.0 × 10-3 T
/18/ Which statement applies to an electric field? (Choose the best answer.)
(A) It has a quantity of energy.
(B) It can exert a force on a particle.
(C) It can exist where no electric charge is present.
(D) All of the above.
(E) None of the above.
/19/ 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) MI is continental not marine.
(D) The statement is false – oil and gas are not rare in MI.
(E) Oil and natural gas deposits are random.
/20/ The purpose of science is …
(A) to understand the mystery of the physical world.
(B) to develop better technology.
(C) to reveal universal principles of nature.
(D) all of the above.
(E) none of the above — science is just a temporary human construct.
/21/ The Scientific Revolution that
began in the 16th century in
(A) experimentation and mathematical analysis.
(B) common sense.
(C) the opinions of a few isolated geniuses.
(D) philosophical ideas from ancient theories.
(E) purely experimentation.
/22/ The weather next December will be quite different from today. Why? (Select the best choice.)
(A) The Earth is now farther from the sun.
(B) The Earth is now closer to the sun.
(C) The northern hemisphere now tilts toward the sun.
(D) The axis of rotation will change.
(E) The sun will move south of the equator.