Electric Potential Energy and Electric Potential Difference 1. MC The SI unit of

Question

Electric Potential Energy and Electric Potential Difference

1.       MC The SI unit of electric potential difference is the (a) joule, (b) newton per coulomb, (c) newton-meter, (d) joule per coulomb.  

2.       MC How does the electrostatic potential energy of two positive point charges change when the distance between them is tripled: (a) It is reduced to one third its original value, (b) it is reduced to one ninth its original value, (c) it is unchanged, or (d) it is increased to three times its original value?  

3.       MC An electron is moved from the positive to negative plate of a charged parallel plate arrangement. How does the sign of the change d in its electrostatic potential energy compare to the sign of the change in electrostatic potential it experiences: (a) Both are positive, (b) the energy change is positive, the potential change is negative, (c) the energy change is negative, the potential change is positive, or (d) both are negative?  

11.     If it takes +1.6 X 10^-5 to move a positively charged particle between two charged parallel plates, (a) what is the charge on the particle if the plates are connected to a 6.0-V battery? (b) Was it moved from the negative to the positive plate or from the positive to the negative plate?  

12. What are the magnitude and direction of the electric field between the two charged parallel plates in Exercise 11 if the plates are separated by 4.0 mm?  

17.   (a) At one third the original distance from a positive point charge, by what factor is the electric potential changed: (1) 1/3, (2) 3, (3) 1/9, or (4) 9? Why? (b) How far from a charge +1.0 X 10^-6C is a point with an electric potential value of 10 kV? (c) How much of a change in potential would occur if the point were moved to three times that distance?  

Equipotential Surfaces and the Electric Field

30.     MC On an equipotential surface (a) the electric potential is constant, (b) the electric field is zero, (c) the electric potential is zero, (d) there must be equal amounts of negative and positive charge.

31.     MC Equipotential surfaces (a) are parallel to the electric field, (b) are perpendicular to the electric field, (c) can be at any angle with respect to the electric field.  

32.     MC An electron is moved from an equipotential surface at + 5.0V to one at +10.0V It is moving generally in a direction (a) parallel to the electric field, (b) opposite to the electric field, (c) in the same direction as the electric field.  

41.     l For a +3.50 x 10^-6C point charge, what is the radius of the equipotential surface that is at a potential of 2.50 kV?  

42.     l A uniform electric field of points vertically upward. How far apart are the equipotential planes that differ by 100 V?  

48.      l The potential difference involved in a typical lightning discharge may be up to 100 MV (million volts). What is the gain in kinetic energy of an electron accelerated through this potential difference? Give your answer in both electron-volts and joules. (Assume that there are no collisions.)

Explanation / Answer

1.d--->joule/coulomb

2.a---->It is reduced to one third of its original value

3.b----->The energy change is positive potential change is negative

11.a)2.7micro.colomb b)negative to positive

12.1.5*10^3V/m. pointing positive to negative

17.a)3 b)0.90m c)-6.7kV

30. a)The electric potential is constant

31.b)are perpendicular to the electric field

32.b)opposite to the electric field

41.V=Q/4*pi*epsilonnot*R

R=Q/4*pi*e0*V

=-3.5*10^-6*9*10^9/2.5*10^3

=12.6m

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