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PHY 217 Final Exam
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Exam of 30 pages for the course EGR 217: Exam at EGR 217: Exam (PHY 217 Final Exam)
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PHY 217 Final Examb. (electric and gravitational) - ANS-Every proton in the universe is surrounded by its
own
a. gravitational field
b. electric field and gravitational field
c. electric field
d. non of the above
e. (direction is changed) - ANS-An electron is shot somewhere between the end of a
horseshoe magnet. the electron
a. speed is increased
b. is repelled by both poles, and therefore is turned back
c. is unaffected by the field
d. is attracted to one of the poles, and repelled by the other
e. direction is changed
a. (electron kinetic energy is changed into heat) - ANS-When we say an appliance "uses
up electricity", we are really saying that
a. electron kinetic energy is changed into heat
b. current disappears
c. the main power supply voltage is lowered
d. electron are taken out of the circuit and put somewhere else
e. electric charges are dissipated
a. (circle the wire in closed loops) - ANS-Magnetic field lines about a current-carrying
wire
a. circle the wire in closed loops
b. extend radially from the wire
c. Choices A and B are both correct
d. None of the above
30 N/C - ANS-The electric force on a 2C charge is 60 N. What is the value of the
electric field where the charge is located?
(F=qE)
e. (16N) - ANS-Two charges separated by one meter exert 1N force on each other. If
the charges are pushed to 1/4 meter separation, the force on each charge will be
a. 8N
,b. 1N
c. 2N
d. 4N
e. 16N
96 W - ANS-If 0.8A of current flow through a light bulb connected to a 120 V outlet, the
power consumed is...(P=IV)
d. (moving electric charge) - ANS-the source of all magnetism is
a. tiny pieces of iron
b. ferromagnetic materials
c. tiny domains of aligned atoms
d. moving electric charge
e. none of these
b. (charge flows in a closed circuit) - ANS-Which statement is correct?
a. voltage flows through an opened or a closed circuit
b. charge flows in a closed circuit
c. resistance flows through an opened circuit
d. current is the primary cause of voltage
b. (repel the magnet as it enters) - ANS-When a bar magnetic is thrust into a coil of
copper wire, the coil tends to
a. attract the magnet as it enters
b. repel the magnet as it enters
c. both of these
d. neither of these
c. (increases) - ANS-A positive charge and a negative charge held near each other are
released. As they move, the force on each particle
a. decreases
b. stays the same
c. increases
b. (attract) - ANS-Like kinds of magnetic poles repel while unlike kinds of magnetic
poles
a. may attract or repel
b. attract
c. repel also
, c. (a potential difference across its ends) - ANS-Electrons are made to flow in a wire
when there is
a. more potential energy at one wire then the other
b. an imbalance of charges in the wire
c. a potential difference across its ends
b. (equally huge) - ANS-Compared to the huge force that attracts an iron tack to a
strong magnet, the force that the tack exerts on the magnet is
a. relatively small
b. equally huge
c. more info needed
b. (less than the resistance of either lamp) - ANS-When 2 lamps are connected in
parallel to a battery, the electrical resistance that the battery senses is
a. more than the resistance then either lamp
b. less than the resistance of either lamp
c. none of these
electrons are loosely bound - ANS-A conductor differs from an insulator in that...
a. (electrical) - ANS-The fundamental force underlying all chemical reactions is
a. electrical
b. nuclear
c. gravitational
d. centripetal
c. (charge) - ANS-Electric potential, measured in volts, is the ratio of electric energy to
amount of electric
a. resistance
b. voltage
c. charge
d. current
e. none of above
a. (quadruples) - ANS-When the distance between 2 charges is halved, the electrical
force between the charges
a. quadruples
b. halves
c. doubles
d. is reduced by 1/4
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