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27 Nov 2019

1. voltage is a measure potential energy per unit charge. if youwere a charge and moved from a higher voltage to a lower voltagehow would your kinetic energy change?
2. what would the firection of the electrical force acting on yoube?
3. how does your answer change is you are a negative charge?
4. what is the firection of the electric field in each case (isthere any differences)?
5. how does the potential energy of a charge change as it movesalong the surface fo the conductor?
6. what is the force on an electron along the surgace o0f theconductor?
7. what is the component of electric field along the surface of aconductor?
8. when the equipotential lines bend, what happeneds to theelectric field lines?

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Sixta Kovacek
Sixta KovacekLv2
27 Apr 2019
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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

A charge q that moves between two points A and B, and has anelectric force acting on it ( and perhaps several other forces) haswork W done on it by the electric force. The electrostatic force isconservative and so we can define a change in electric potentialenergy, Delta U = -W. We defined electric field using the relationF^^\-> = q E^^\->, and in a similar way we define electricpotential commonly called voltage as
Delta V = V_B - V_A = -W/q=(Delta U)/q or equivalently q Delta V =q (V_B - V_A) = -W=Delta U

A ball has mass 3.0 µg and charge -6 nC moves from point A to pointB. It has the same speed at points A and B, and the work done bythe electric field during the move is -1.5 mJ.
(a) What is the change in electric potential energy of the ball?1
(b) What is the change in voltage between points A and B? 2
(c) At which point does the ball have a higher electric potentialenergy?
(d) Which point has the higher voltage?
(e) Has the kinetic energy of the ball changed?

1.Two uncharged, conducting spheres, A and B, are held at rest oninsulating stands and are in contact. A positively charged rod isbrought near sphere A. While the rod is in place, the two spheresare separated. How will the spheres be charged, if at all, afterthey are separated?
Sphere A Sphere B
(a) positive positive
(b) positive negative
(c) negative positive
(d) negative negative
(e) zero zero

2. A charged conductor is brought near an uncharged insulator.Which one of the following statements is true?
(a) Both objects will repel each other.
(b) Both objects will attract each other.
(c) Neither object exerts an electrical force on the other.
(d) The objects will repel each other only if the conductor has anegative charge.
(e) The objects will attract each other only if the conductor has apositive charge.

3. An electron is moved from point A, where the electric potentialis VA = –240 V, to point B, where the electric potential is VB =–360 V. What is the change in the electric
potential energy?
(a) 1.92×10–17 J (b) 2.04×10–17 J (c) 5.75×10–17 J (d) 8.98×10–17 J(e) 1.05×10–16 J

4. A -2q charge is located a distance d to the right of a +4qcharge, along the x
axis. At which point (or points) along the axis does the electricfield go to zero? To
solve this problem, consider an observer at point P, which is anarbitrary distance x from the +4q charge. Find the value (orvalues) for x (in terms of the separation distance d) where thetotal electric field vanishes.
(a) The electric field is never zero in the vicinity of thesecharges.
(b) The electric field is zero at x = -0.328d.
(c) The electric field is zero at x = +4.22d.
(d) The electric field is zero at both x = -2.26d and x =+2.26d.
(e) The electric field is zero at x = +3.41d.

5. point A is a distance L away from a point charge Q. Point B is adistance 4L away from Q. What is the ratio of the electrostaticpotential at B to that at A, i.e., what is VB/VA?
(a) 1/16
(b) 1/9
(c) 1/4
(d) 1/3
(e) can not be determined without specifying Q and L

6. Which one of the following statements best explains why it ispossible to define an electric potential
in a region of space that contains an electric field?
(a) Work must be done to bring two positive charges closertogether.
(b) Like charges repel one another and unlike charges attract oneanother.
(c) A positive charge will gain kinetic energy as it approaches anegative charge.
(d) The work required to bring two charges together is independentof the path taken.
(e) A negative charge will gain kinetic energy as it moves awayfrom another negative charge.

a)The figure below shows a test charge q betweenthetwo positive charges. Find the force (in newtons) on thetestcharge for q = 2 µC. Give a positive answer iftheforce is to the right and a negative answer if the force is totheleft.



b) For the previous question, find the electric field(innewtons/coulomb) at the position of test charge. Again, supplyapositive value if the electric field points to the right andanegative value if it points to the left.

c) How much work (in joules) is done in moving a charge of 2.5μCadistance of 53 cm along an equipotential at 10~V?
d) The field lines associated with a uniform electric fieldina region of space are shown in the figure below. Imaginedrawingtwo equipotentials in the plane of the figure, one passingthroughpoint A and and one passing through point B. If the electricfieldis 450 N/C, how much does the potential change in going from AtoB? Provide your answer in volts and use a positive value ifitincreases and a negative value if it decreases.




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