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- 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 |
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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.
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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
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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
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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.
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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.
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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
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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
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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.
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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.
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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)
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If
electrons move through a pocket calculator during a full day's operation, how many coulombs of charge moved through it?
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To start a car engine, the car battery moves
electrons through the starter motor. How many coulombs of charge were moved?
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Questions & Answers
what is defense mechanism
what is defense mechanisms
Chinaza
I'm interested in biological psychology and cognitive psychology
what does preconceived mean
How can I develope my cognitive domain
why is communication effective
Communication is effective because it allows individuals to share ideas, thoughts, and information with others.
effective communication can lead to improved outcomes in various settings, including personal relationships, business environments, and educational settings. By communicating effectively, individuals can negotiate effectively, solve problems collaboratively, and work towards common goals.
it starts up serve and return practice/assessments.it helps find voice talking therapy also assessments through relaxed conversation.
miss
Every time someone flushes a toilet in the apartment building, the person begins to jumb back automatically after hearing the flush, before the water temperature changes. Identify the types of learning, if it is classical conditioning identify the NS, UCS, CS and CR. If it is operant conditioning, identify the type of consequence positive reinforcement, negative reinforcement or punishment
please i need answer
Wekolamo
because it helps many people around the world to understand how to interact with other people and understand them well, for example at work (job).
Agreed 👍 There are many parts of our brains and behaviors, we really need to get to know. Blessings for everyone and happy Sunday!
ARC
A child is a member of community not society elucidate ?
Isn't practices worldwide, be it psychology, be it science. isn't much just a false belief of control over something the mind cannot truly comprehend?
compare and contrast skinner's perspective on personality development on freud
Skinner skipped the whole unconscious phenomenon and rather emphasized on classical conditioning
war
explain how nature and nurture affect the development and later the productivity of an individual.
nature is an hereditary factor while nurture is an environmental factor which constitute an individual personality. so if an individual's parent has a deviant behavior and was also brought up in an deviant environment, observation of the behavior and the inborn trait we make the individual deviant.
Samuel
I am taking this course because I am hoping that I could somehow learn more about my chosen field of interest and due to the fact that being a PsyD really ignites my passion as an individual the more I hope to learn about developing and literally explore the complexity of my critical thinking skills
and having a good philosophy of the world is like a sandwich and a peanut butter 👍
Jonathan
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interpersonal relationships
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Source:
OpenStax, College physics for ap® courses. OpenStax CNX. Nov 04, 2016 Download for free at https://legacy.cnx.org/content/col11844/1.14
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