Question 13.5 pts
One of the major differences between gravitational and electric forces is that electrical forces ______.
Group of answer choices
are weaker
obey the inverse-square law
act over short distances
only attract
repel or attract
Question 23.5 pts
Pigeons navigate mainly by _______.
Group of answer choices
magnetic sensors in their heads
a keen sense of smell
ultra-high-pitched sounds
a good memory
none of the above
Question 33.5 pts
A circuit breaker is ______.
Group of answer choices
capacitor
battery
fuse
all of the above
none of the above
Question 43.5 pts
The current produced by voltage in a circuit is impeded by _______.
Group of answer choices
closed switches
electric barriers
electric resistance
none of the above
Question 53.5 pts
Steve touches a 100,000-volt Van de Graaff generator. Even though the voltage is high, the relatively small amount of charge means a relatively small amount of _____.
Group of answer choices
polarization
conduction
electric field
energy transfer
Question 63.5 pts
The amount of current in a CFL rated 24W 120V is ______.
Group of answer choices
5 A
more than 6 A
less than 4 A
Question 73.5 pts
Electrons flow in an electrical circuit by ______.
Group of answer choices
colliding with molecules
interacting with an established electric field
being bumped by other electrons
none of the above
Question 83.5 pts
Over geologic history the Earth's magnetic field ______.
Group of answer choices
has increased in strength exponentially
has been relatively stable
has reversed direction many times
is unknown
Question 93.5 pts
An electrostatic force F attracts two charges. If the magnitude of the charge of both particles is doubles and the distance between them is also doubled. The force will be ________.
Group of answer choices
F/2
2 F
F/4
F
none of the above
Question 103.5 pts
An electron and a proton ______.
Group of answer choices
repel each other
neither attract nor repel each other
attract each other
Question 113.5 pts
The current in two identical light bulbs connected in series is 1 A. The voltage across both bulbs is 120 V. The resistance of a single light bulb is ______.
Group of answer choices
220 ohms
60 ohms
120 ohms
40 ohms
none of the above
Question 123.5 pts
We know that electric charges can be isolated but magnetic poles ______.
Group of answer choices
gather in clusters
can also
cannot
none of the above
Question 133.5 pts
The equivalent resistance of 2-ohm, 2-ohm, and 1-ohm in parallel is about _____.
Group of answer choices
2 ohms
0.5 ohm
0.2 ohms
20 ohms
0.05 ohm
Question 143.5 pts
The kilowatt-hour is a unit of _______.
Group of answer choices
voltage
power
current
energy
resistance
Question 153.5 pts
Earth's magnetic field is _________.
Group of answer choices
protective to life on Earth
something we've learned to live with
useful to pigeons but not to humans
Question 163.5 pts
Two charges separated by 1 m exert 1-N forces on each other. If the magnitude of each charge is tripled, the force on each charge is _______.
Group of answer choices
3 N
6 N
9 N
12 N
none of the above
Question 173.5 pts
Sometimes the current in lamps is too feeble to produce glowing of the lamp filaments, which occurs when _____.
Group of answer choices
too many lamps are connected in series
too much current is drawn by the battery
too many lamps are connected in parallel
Question 183.5 pts
A semiconductor can be ______.
Group of answer choices
a conductor
an insulator
both of these
neither of these
Question 193.5 pts
What does the electric field inside a Van de Graaff generator depend on?
Group of answer choices
amount of charge and volume of the dome
volume of the dome
amount of external charge
none of the above
Question 203.5 pts
An uncharged pith ball is suspended by a fish line. When a positively-charged rod is brought nearby, the pith ball _______.
Group of answer choices
is unaffected
moves toward the rod
moves away from the rod
none of the above
Please show your full solution steps. First state what is given, then start with the symbolic equation, then show data entered into the equation, and then the final answer with proper units. Please write your steps vertically. You will not gain credit for showing only the answer.
Question 2110 pts
Calculate the Electrostatic force between a proton and an electron if there were separated by a distance of 0.001 m. The charge of the electron and the proton is the same except that the electron is negatively charged and the proton is positively charged. The magnitude of the charge is 1.6 E -19 C. Given that the proportionality constant is k = 9 E 9 M.m2/C2.
Question 2210 pts
Calculate the consumption rate (in Watts) of a toaster that is connected to a 120-V outlet and draws a current of 2 A.
Question 2310 pts
How much does it cost (in cents) to operate 1500-Watt heater for 2 hours? Assume the power company charges 10 cents per kWh.
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