



What is the internal energy of a system consisting of two point charges, one 2.0 µC, and the other −3.0 µC, placed 1.2 m away from each other?
 −3.8×10
^{2} J
 −4.5×10
^{2} J
 4.5×10
^{2} J
 3.8×10
^{2} J
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A system of three point charges has a 1.00 µC charge at the origin, a −2.00 µC charge at
x =30 cm, and a 3.00 µC charge at
x =70 cm. What is the total stored potential energy of this configuration?
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A system has 2.00 µC charges at (50 cm, 0) and (−50 cm, 0) and a −1.00 µC charge at (0, 70 cm). As the
y coordinate of the −1.00 µC charge increases, the potential energy ___. As the
y coordinate of the −1.00 µC charge decreases, the potential energy ___.
 increases, increases
 increases, decreases
 decreases, increases
 decreases, decreases
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A system of three point charges has a 1.00 µC charge at the origin, a −2.00 µC charge at
x =30 cm, and a 3.00 µC charge at
x =70 cm. What happens to the total potential energy of this system if the −2.00 µC charge and the 3.00 µC charge trade places?
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Take a square configuration of point charges, two positive and two negative, all of the same magnitude, with like charges sharing diagonals. What will happen to the internal energy of this system if one of the negative charges becomes a positive charge of the same magnitude?
 increase
 decrease
 no change
 not enough information
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Take a square configuration of point charges, two positive and two negative, all of the same magnitude, with like charges sharing diagonals. What will happen to the internal energy of this system if the sides of the square decrease in length?
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A system has 2.00 µC charges at (50 cm, 0) and (−50 cm, 0) and a −1.00 µC charge at (0, 70 cm), with a velocity in the –
y direction. When the −1.00 µC charge is at (0, 0) the potential energy is at a ___ and the kinetic energy is ___.
 maximum, maximum
 maximum, minimum
 minimum, maximum
 minimum, minimum
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Section summary
 Electric potential is potential energy per unit charge.
 The potential difference between points A and B,
${V}_{\mathrm{B}}\u2013{V}_{\mathrm{A}}$ , defined to be the change in potential energy of a charge
$q$ moved from A to B, is equal to the change in potential energy divided by the charge, Potential difference is commonly called voltage, represented by the symbol
$\text{\Delta}V$ .
$\mathrm{\Delta}V=\frac{\text{\Delta PE}}{q}\phantom{\rule{0.25em}{0ex}}\text{and \Delta PE =}\phantom{\rule{0.25em}{0ex}}q\mathrm{\Delta}V\text{.}$
 An electron volt is the energy given to a fundamental charge accelerated through a potential difference of 1 V. In equation form,
$\begin{array}{lll}\text{1 eV}& =& \left(1.60\times {\text{10}}^{\text{\u201319}}\phantom{\rule{0.25em}{0ex}}\text{C}\right)\left(\mathrm{1\; V}\right)=\left(1.60\times {\text{10}}^{\text{\u201319}}\phantom{\rule{0.25em}{0ex}}\text{C}\right)\left(\mathrm{1\; J/C}\right)\\ & =& 1.60\times {\text{10}}^{\text{\u201319}}\phantom{\rule{0.25em}{0ex}}\text{J.}\end{array}$
 Mechanical energy is the sum of the kinetic energy and potential energy of a system, that is,
$\text{KE}+\text{PE}.$ This sum is a constant.
Conceptual questions
If the voltage between two points is zero, can a test charge be moved between them with zero net work being done? Can this necessarily be done without exerting a force? Explain.
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Questions & Answers
What is meant by dielectric charge?
what happens to the size of charge if the dielectric is changed?
omega= omega not +alpha t
derivation
u have to derivate it respected to time ...and as w is the angular velocity uu will relace it with "thita × time""
Abrar
do to be peaceful with any body
the angle subtended at the center of sphere of radius r in steradian is equal to 4 pi how?
if for diatonic gas Cv =5R/2 then gamma is equal to 7/5 how?
Saeed
displacement in easy way.
binding energy per nucleon
Because HE needs someone to dominate the earth (Gen. 1:26)
Olorunfemi
why god made humenity
Ali
Is the object in a conductor or an insulator? Justify your answer. whats the answer to this question? pls need help figure is given above
ok we can say body is electrically neutral ...conductor this quality is given to most metalls who have free electron in orbital d ...but human doesn't have ...so we re made from insulator or dielectric material ... furthermore, the menirals in our body like k, Fe , cu , zn
Abrar
when we face electric shock these elements work as a conductor that's why we got this shock
Abrar
how do i calculate the pressure on the base of a deposit if the deposit is moving with a linear aceleration
why electromagnetic induction is not used in room heater ?
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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