-
Home
- College physics for ap® courses
- Electric charge and electric
- Static electricity and charge:
In an experiment, three microscopic latex spheres are sprayed into a chamber and become charged with +3
e , +5
e , and −3
e , respectively. Later, all three spheres collide simultaneously and then separate. Which of the following are possible values for the final charges on the spheres? Select
two answers.
|
X |
Y |
Z |
| (a) |
+4
e |
−4
e |
+5
e |
| (b) |
−4
e |
+4.5
e |
+5.5
e |
| (c) |
+5
e |
−8
e |
+7
e |
| (d) |
+6
e |
+6
e |
−7
e |
Got questions? Get instant answers now!
If objects X and Y attract each other, which of the following will be false?
- X has positive charge and Y has negative charge.
- X has negative charge and Y has positive charge.
- X and Y both have positive charge.
- X is neutral and Y has a charge.
Got questions? Get instant answers now!
Suppose a positively charged object A is brought in contact with an uncharged object B in a closed system. What type of charge will be left on object B?
- negative
- positive
- neutral
- cannot be determined
Got questions? Get instant answers now!
What will be the net charge on an object which attracts neutral pieces of paper but repels a negatively charged balloon?
- negative
- positive
- neutral
- cannot be determined
Got questions? Get instant answers now!
When two neutral objects are rubbed against each other, the first one gains a net charge of 3
e. Which of the following statements is true?
- The second object gains 3
e and is negatively charged.
- The second object loses 3
e and is negatively charged.
- The second object gains 3
e and is positively charged.
- The second object loses 3
e and is positively charged.
Got questions? Get instant answers now!
In an experiment, a student runs a comb through his hair several times and brings it close to small pieces of paper. Which of the following will he observe?
- Pieces of paper repel the comb.
- Pieces of paper are attracted to the comb.
- Some pieces of paper are attracted and some repel the comb.
- There is no attraction or repulsion between the pieces of paper and the comb.
Got questions? Get instant answers now!
In an experiment a negatively charged balloon (balloon X) is repelled by another charged balloon Y. However, an object Z is attracted to balloon Y. Which of the following can be the charge on Z? Select
two answers.
- negative
- positive
- neutral
- cannot be determined
Got questions? Get instant answers now!
Suppose an object has a charge of 1 C and gains 6.88×10
18 electrons.
- What will be the net charge of the object?
- If the object has gained electrons from a neutral object, what will be the charge on the neutral object?
- Find and explain the relationship between the total charges of the two objects before and after the transfer.
- When a third object is brought in contact with the first object (after it gains the electrons), the resulting charge on the third object is 0.4 C. What was its initial charge?
(a) -0.1 C, (b) 1.1 C, (c) Both charges will be equal to 1 C, law of conservation of charge, (d) 0.9 C
Got questions? Get instant answers now!
The charges on two identical metal spheres (placed in a closed system) are -2.4×10
−17 C and -4.8×10
−17 C.
- How many electrons will be equivalent to the charge on each sphere?
- If the two spheres are brought in contact and then separated, find the charge on each sphere.
- Calculate the number of electrons that would be equivalent to the resulting charge on each sphere.
Got questions? Get instant answers now!
In an experiment the following observations are made by a student for four charged objects W, X, Y, and Z:
- A glass rod rubbed with silk attracts W.
- W attracts Z but repels X.
- X attracts Z but repels Y.
- Y attracts W and Z.
Estimate whether the charges on each of the four objects are positive, negative, or neutral.
W is negative, X is positive, Y is negative, Z is neutral.
Got questions? Get instant answers now!
Section summary
- There are only two types of charge, which we call positive and negative.
- Like charges repel, unlike charges attract, and the force between charges decreases with the square of the distance.
- The vast majority of positive charge in nature is carried by protons, while the vast majority of negative charge is carried by electrons.
- The electric charge of one electron is equal in magnitude and opposite in sign to the charge of one proton.
- An ion is an atom or molecule that has nonzero total charge due to having unequal numbers of electrons and protons.
- The SI unit for charge is the coulomb (C), with protons and electrons having charges of opposite sign but equal magnitude; the magnitude of this basic charge
is
- Whenever charge is created or destroyed, equal amounts of positive and negative are involved.
- Most often, existing charges are separated from neutral objects to obtain some net charge.
- Both positive and negative charges exist in neutral objects and can be separated by rubbing one object with another. For macroscopic objects, negatively charged means an excess of electrons and positively charged means a depletion of electrons.
- The law of conservation of charge ensures that whenever a charge is created, an equal charge of the opposite sign is created at the same time.
Conceptual questions
Problems&Exercises
Common static electricity involves charges ranging from nanocoulombs to microcoulombs. (a) How many electrons are needed to form a charge of
(b) How many electrons must be removed from a neutral object to leave a net charge of
?
(a)
(b)
Got questions? Get instant answers now!
If
electrons move through a pocket calculator during a full day's operation, how many coulombs of charge moved through it?
Got questions? Get instant answers now!
To start a car engine, the car battery moves
electrons through the starter motor. How many coulombs of charge were moved?
Got questions? Get instant answers now!
Questions & Answers
Three charges q_{1}=+3\mu C, q_{2}=+6\mu C and q_{3}=+8\mu C are located at (2,0)m (0,0)m and (0,3) coordinates respectively. Find the magnitude and direction acted upon q_{2} by the two other charges.Draw the correct graphical illustration of the problem above showing the direction of all forces.
To solve this problem, we need to first find the net force acting on charge q_{2}. The magnitude of the force exerted by q_{1} on q_{2} is given by F=\frac{kq_{1}q_{2}}{r^{2}} where k is the Coulomb constant, q_{1} and q_{2} are the charges of the particles, and r is the distance between them.
Muhammed
What is the direction and net electric force on q_{1}= 5µC located at (0,4)r due to charges q_{2}=7mu located at (0,0)m and q_{3}=3\mu C located at (4,0)m?
what is the change in momentum of a body?
Capacitor is a separation of opposite charges using an insulator of very small dimension between them. Capacitor is used for allowing an AC (alternating current) to pass while a DC (direct current) is blocked.
Gautam
A motor travelling at 72km/m on sighting a stop sign applying the breaks such that under constant deaccelerate in the meters of 50 metres what is the magnitude of the accelerate
What is Thermodynamics
Muordit
velocity can be 72 km/h in question. 72 km/h=20 m/s, v^2=2.a.x , 20^2=2.a.50, a=4 m/s^2.
Mehmet
A boat travels due east at a speed of 40meter per seconds across a river flowing due south at 30meter per seconds. what is the resultant speed of the boat
50 m/s due south east
Someone
which has a higher temperature, 1cup of boiling water or 1teapot of boiling water which can transfer more heat 1cup of boiling water or 1 teapot of boiling water explain your . answer
I believe temperature being an intensive property does not change for any amount of boiling water whereas heat being an extensive property changes with amount/size of the system.
Someone
temperature for any amount of water to boil at ntp is 100⁰C (it is a state function and and intensive property) and it depends both will give same amount of heat because the surface available for heat transfer is greater in case of the kettle as well as the heat stored in it but if you talk.....
Someone
about the amount of heat stored in the system then in that case since the mass of water in the kettle is greater so more energy is required to raise the temperature b/c more molecules of water are present in the kettle
Someone
physics, biology and chemistry
this is my Field
ALIYU
field is a region of space under the influence of some physical properties
Collete
what is ogarnic chemistry
determine the slope giving that 3y+ 2x-14=0
WISDOM
Another formula for Acceleration
pratica A on solution of hydro chloric acid,B is a solution containing 0.5000 mole ofsodium chlorid per dm³,put A in the burret and titrate 20.00 or 25.00cm³ portion of B using melting orange as the indicator. record the deside of your burret tabulate the burret reading and calculate the average volume of acid used?
how do lnternal energy measures
Esrael
Two bodies attract each other electrically. Do they both have to be charged? Answer the same question if the bodies repel one another.
No. According to Isac Newtons law. this two bodies maybe you and the wall beside you.
Attracting depends on the mass och each body and distance between them.
Dlovan
Are you really asking if two bodies have to be charged to be influenced by Coulombs Law?
Robert
like charges repel while unlike charges atttact
Raymond
What is specific heat capacity
Specific heat capacity is a measure of the amount of energy required to raise the temperature of a substance by one degree Celsius (or Kelvin). It is measured in Joules per kilogram per degree Celsius (J/kg°C).
AI-Robot
specific heat capacity is the amount of energy needed to raise the temperature of a substance by one degree Celsius or kelvin
ROKEEB
Got questions? Join the online conversation and get instant answers!
Source:
OpenStax, College physics for ap® courses. OpenStax CNX. Nov 04, 2016 Download for free at https://legacy.cnx.org/content/col11844/1.14
Google Play and the Google Play logo are trademarks of Google Inc.
