11) What is the nominal resistance of a 100-W light bulbdesigned to be used in a
ID: 1729654 • Letter: 1
Question
11) What is the nominal resistance of a 100-W light bulbdesigned to be used in a 120-V circuit?
A) 144 ? B) 0.83 ? C) 12.0 ? D) 1.2 ?
12) 14 A of current flows through 8.0 Omega for 24hours. How much does this cost if energy costs $0.09/kWh?
A) $2.16 B) $1.04 C) $3.39 D) $0.24
13) As more resistors are added in parallel to a constantvoltage source, the power supplied by the source
A) does not change.
B) decreases.
C) increases.
D) increases for a time and then starts to decrease.
15) Capacitances of 10 F and 20 F areconnected in parallel, and this pair is then connected in serieswith a 30-F capacitor. What is the equivalentcapacitance of this arrangement?
A) 10 F B) 15F C) 60 F D) 25 F
16) A charged particle moves with a constant speed througha region where a uniform magnetic field is present. If themagnetic field points straight upward, the magnetic force acting onthis particle will be maximum when the particle moves
A) straight downward.
B) in a plane parallel to the Earth's surface.
C) upward at an angle of 450 above thehorizontal.
D) straight upward.
17) A wire carries a current of 10 A in a direction of300 with respect to the direction of a 0.30-T magneticfield. Find the magnitude of the magnetic force on a 0.50-mlength of the wire.
A) 1.5 N B) 0.75 N C) 3.0 N D) 6.0 N
18) How many turns should a 10-cm long solenoid have if itis to generate a 1.5 x 10-3 T magnetic field on 1.0 A ofcurrent?
A) 15 B) 12 C) 1194 D) 119
19) Faraday's law of induction states that the emf inducedin a loop of wire is proportional to
A) current divided by time.
B) the time variation of the magnetic flux.
C) the magnetic flux.
D) the magnetic flux density times the loop's area.
20) A transformer is a device used to
A) transform a direct current into an alternating current.
B) increase or decrease a dc voltage.
C) transform an alternating current into a direct current.
D) increase or decrease an ac voltage.
Explanation / Answer
A charged particle moves with a constant speed through a region where a uniform magnetic field is present. If the magnetic field points straight upward, the magnetic force acting on this particle will be maximum when the particle moves
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