- A source of negative charge is placed near an electroscope and the needle deflects. While the source of charge is still held above the scope a person touches the metal plate attached to the scope with their finger. The needle.....
Your answer:
falls because electrons flow from the ground through the person to the electroscope.
stays deflected because it is not grounded
stays deflected because positive charge can not move.
falls because electrons flow from the electroscope through the person to ground.
- An electron and a proton are separated by a distance of 1m. What happens to the size of the force on the proton if the electron is moved 0.5m closer to the proton?
Your answer:
It increases to 2 times its original value
it decreases to 1/4 its original value
It decreases to 1/2 its original value
It increases to 4 times its original value
- The force between a 0.015 C charge and a 10.3 x10^-6 C charge is 0.4 N. How far apart are they?
Your answer:
59 m
39 cm
39 m
59 mm
- What will be the charge of the sphere in step e above if steps a - d are followed?
Your answer:
equal numbers of positives and negatives
negative
positive
it will be neutral
- Charge carriers in a metal are electrons rather than protons because electrons are.....
Your answer:
loosely bound
lighter
all of these answers
far from the nucleus
- Oliver, whose mass is 65 kg, and Olivia, whose mass is 45 kg, sit 2.0 m apart in their physics classroom. What is the gravitational force of attraction between the two of them?
Your answer:
731 N
9.75x10^-8 N
6.58x10^12 N
4.9x10^-8 N
- What is the gravitational field strength on the surface of an asteroid that has a radius of 20m and a mass of 1x10^4 kg?
Your answer:
2.45x10^-2 N/kg
3.34x10^-8 N/kg
1.67x10^-9 N/kg
2.25x10^11 N/kg
- The potential difference between two metal plates separated by 0.5mm is 1.8x10^4 N/C. How much potential difference is there across the plates?
Your answer:
3.6x10^7 V
9000 V
3.6x10^4 V
9 V
- At what distance from a point charge of 8.0x10^-6 C would the electric potential be 4.2x10^4 V?
Your answer:
2.9 m
0.76 m
0.58 m
1.7 m
- If a Van de Graff Generator has an electric potential (i.e., a voltage) of 600 Volts and a charge of 0.000001 Coulombs. What is the PE of the charge?
Your answer:
6x10^8 J
6x10^-4 J
no answer
600 J
- If you were to grab onto a single wire (suspended above the ground by the wire only) that was at a potential of 1000 Volts,
Your answer:
You should make sure that you are insured.
no answer
You would not have any current flow since there is no electric potential difference.
There will be a current, but your resistance is so large that you will not be electrocuted.
- In a common circuit, electrons move at speeds of........
Your answer:
the speed of a sound wave
the speed of light
a fraction of a centimeter per second
many centimeters per second
- The number of electrons delivered to an average American home by an average power utility in 1984 was....
Your answer:
110
billions of billions
220
zero
- A circuit has a current of 2.0 Amps. How many Coulombs of charge pass through the circuit in 3.0 seconds?
Your answer:
6.0 C
2.0 C
4.0 C
3.0 C
- A charge of 12 C passes through an electroplating apparatus in 2 min. What is the average current?
Your answer:
6 A
0.2 A
24 A
0.1 A
- Which wire probably has the least resistance?
Your answer:
short, wide, small resistivity
short, narrow, high resistivity
long, narrow with small resistivity
long, wide, small resistivity
- When we say an appliance uses up electricity, we really are saying that....
Your answer:
electrons are taken out of the circuit and put somewhere else
current disappears
electric kinetic energy is changed into heat
the main power supply voltage is lowered
- Which of the following is the smallest unit of energy?
Your answer:
Joule
kW-h
Calorie
electron-volt
- How much does it cost to operate a 25 W soldering iron for 8 hrs, if energy costs $0.08/kW-hr?
Your answer:
$1.50
$0.25
$0.16
$0.016
- A 150 W light bulb running on 110 V draws how much current?
Your answer:
2.0 A
1.4 A
0.73 A
15 A
- If a lamp is measured to have a resistance of 45 Ohm when it operates at a power of 80 W, what is the current in the lamp?
Your answer:
2.10 A
0.83 A
1.77 A
1.33 A
- If you accidentally grabed the prongs of a partially plugged-in 120V electrical plug on a day when your skin resistance was 120 000 ohms, how much current would pass through your body?
Your answer:
0.001 A
12 000 000 A
100 000 A
1000 A
- If the resistance in a constant voltage circuit is doubled, the power dissipated by that circuit will......
Your answer:
increase by a factor of two
decrease to one-half its original value
decrease to one-forth its original value
increase by a factor of four
- The circuits above all have the same type of bulb (circles) and the same individual power supplies. Bulb D is the same brightness and bulb A?
Your answer:
True
no answer
no answer
False
- Consider the circuits in question 24. . Bulb B is the same brightness as bulb H
Your answer:
no answer
True
no answer
False
- Consider the circuits in question 24. The bottom right circuit has a smaller total resistance than the bottom left circuit?
Your answer:
False
no answer
True
no answer
- The power transformed by bulb B is half that of bulb A?
Your answer:
False
True
no answer
no answer
- A 6 Ohm and a 12 Ohm resistor are connected in series to a 36 V battery. What is the power dissipated in the 6 Ohm resistor?
Your answer:
48 W
None of these answers are correct
486 W
216 W
- 6 Ohm, 12 Ohm and 4 Ohm resistors are connected in parallel to a 36 V battery. What is the power dissipated in the 4 Ohm resistor?
Your answer:
648 W
1296 W
18 W
324 W
- Find the voltage, current, and resistance where it is needed in the circuit above.
Your answer:
V1=50V, V2=150V , I = 1A , Rtotal = 200 Ohms
V1=200V, V2=200V , I = 5.33A , Rtotal = 200 Ohms
V1=150V, V2=50V , I = 0.5A , Rtotal = 400 Ohms
V1=100V, V2=300V , I = 2A , Rtotal = 100 Ohms
- Find the voltage, current, and resistance where it is needed in the circuit above.
Your answer:
V1=100V V2=100V , I1=0.2A , I2=0.2A , Itotal=0.4A , Rtotal=500 Ohms
V1=100V V2=100V , I1=1A , I2=0.25A , Itotal=1.25A , Rtotal=80 Ohms
V1=100V V2=100V , I1=0.2A , I2=0.2A , Itotal=0.4A , Rtotal=80 Ohms
V1=100V V2=100V , I1=1A , I2=0.25A , Itotal=0.25A , Rtotal=500 Ohms
- Two 4 Ohm resistors are connected in parallel, and this combination is connected in series with a 3 Ohm. What is the effective resistance of this combination?
Your answer:
11 Ohms
1.2 Ohms
7 Ohms
5 Ohms
- A 3 Ohm resistor is connected in parallel with a OhmW resistor. This combination is connected in series with a 4 Ohm resistor. The resistors are connected to a 12V battery. How much power is dissipated in the 3 Ohm resistor?
Your answer:
12 W
6.0 W
2.7 W
5.3 W