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Chapter 24
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Gravity
Terms in this set (41)
An electron moves from point i to point f, in the direction of a uniform electric field. During this displacement:
The work done by the field is negative and the potential energy of the electron field system increases.
A particle with a charge of 5.5x10^-8 C is 3.5 cm from a particle with a charge of -2.3 x 10^-8 C. The potential energy of this two particle system, relative to the potential energy at infinite separation, is:
-3.2 x 10^-4 J
A particle with a charge of 5.5 x 10^-8 C is fixed at the origin. A particle with a charge of -2.3 x 10^-8 C is moved from x = 3.5 cm on the x axis to y = 4.3 cm on the y axis. The change in potential energy of the two particle system is:
6.0 x 10^-5 J
A particle with a charge of 5.5 x 10^-8 C charge is fixed at the origin. A particle with a charge of -2.3 x 10^-8 C charge is moved from x =3.5 cm on the x axis to y = 3.5 cm on the y axis. The change in potential energy of the two particle system is:
0
Three particles lie on the x axis: particle 1, with a charge of 1x10^-8 C is at x =1cm, particle 2 with a charge of 2x10^-8 C, is at x = 2cm and particle 3 with a charge of -3x10^-8C is at x=3cm. The potential energy of this arrangement, relative to the potential energy for infinite separation is:
-4.9 x 10^-4 J
Two identical particles, each with charge q, are placed on the x axis, one at the origin and the other at x = 5cm. A third particle, with charge -q, is placed on the x axis so the potential energy of the three particle system is the same as the potential energy at infinite separation. Its x coordinate is:
13 cm
If 500 J of work are required to carry a charged particle between two points with a potential difference of 20 V, the magnitude of the charge on the particle is:
12.5 C
The potential difference between two points is 100 V. If a particle with a charge of 2 C is transported from one of these points to the other, the magnitude of the work done is:
200 J
During a lightning discharge, 30 C of charge move through a potential difference of 1.0 x 10^8 V in 2.0 x 10^-2 s. The energy released by this lightning bolt is:
3.0 x 10^9 J
Points R and T are each a distance d from each of two particles with charges of equal magnitudes and opposite signs as shown. If k = 1/4πε0, the work required to move a particle with a negative charge q from R to T is:
0
Points R and T are each a distance d from each of two particles with equal positive charges. If k = 1/4πε0, the work required to move a particle with charge q from R to T is:
0
Two particle with charges Q and -Q are fixed at the vertices of an equilateral triangle with sides of length a. If k = 1/4πε0, the work required to move a particle with charge q from the other vertex to the center of the line joining the fixed particles is:
0
A particle with mass m and charge -q is projected with speed v(nought) into the region between two parallel plates as shown. The potential difference between the two plates is V and their separation is d. The change in kinetic energy of the particle as it traverses this region is.
qV
An electron is accelerated from rest through a potential difference V. Its final speed is proportional to
sqrt(V)
In separate experiments, four different particles each start from far away with the same speed and impinge directly on a gold nucleus. The masses and charges of the particles are
1. m0, q0
2. 2m0, 2q0
3. 2m0, q0/2
4. m0/2, 2q0
Rank the particles according to the distance of closest approach to the gold nucleus, from smallest to largest.
3, 1 and 2 tie, then 4
Two large parallel conducting plates are separated by a distance d, placed in a vacuum and connected to a source of potential difference V. An oxygen ion, with charge 2e, starts from rest on the surface of one plate and accelerates to the other. If e denotes the magnitude of the electron charge, the final kinetic energy of this ion is:
2eV
An electron volt is:
the energy gained by an electron in moving through a potential difference of 1 volt
An electron has charge -e and mass m. A proton has charge e and mass 1840m. A "proton volt" is equal to:
1eV
Two conducting spheres, one having twice the diameter of the other, are separated by a distance large compared to their diameters. The smaller sphere (1) has a charge q and the larger sphere (2) is uncharged. If the spheres are then connected by a long thin wire:
1 and 2 have the same potential
Two conducting spheres are far apart. The smaller sphere carries a total charge Q. The larger sphere has a radius that is twice that of the smaller and is neutral. After two spheres are connected by a conducting wire, the charges on the smaller and larger spheres, respectively, are:
Q/3 and 2Q/3.
Three possible configurations for an electron e and a proton p are shown. Take the zero of potential to be at infinity and rank the three configurations according to the potential at S, from most negative to most positive.
1 and 2 tie, then 3
A conducting sphere with radius R is charged until the magnitude of the electric field just outside its surface is E. The electric potential of the sphere, relative to the potential far away, is:
ER
A 5 cm radius conducting sphere has a surface charge density of 2 x 10^-6 C/ m^2 on its surface. Its electric potential relative to the potential far away, is:
1.1 x 10^4V
A hollow metal sphere is charged to a potential V. The potential at its center is:
V
Positive charge is distributed uniformly throughout a non-conducting sphere. The highest electric potential occurs:
At the center
A total charge of 7x10^-8 C is uniformly distributed throughout a non-conducting sphere with a radius of 5 cm. The electric potential at the surface, relative to the potential far away, is about:
1.3 x 10^4 V
Eight identical spherical raindrops are each at a potential V, relative to the potential far away. They coalesce to make one spherical raindrop whose potential is:
4V
A metal sphere carries a charge of 5 x 10^-9 C and is at a potential of 400 V, relative to the potential far away. The potential at the center of the sphere is:
400 V
A 5 cm radius isolated conducting sphere is charged so its potential is +100 V, relative to the potential far away. The charge density on its surface is:
+1.8x10^-8 C/m^2
A conducting sphere has charge Q and its electric potential is V, relative to the potential far away. If the charge is doubled to 2Q, the potential is:
2V
The potential difference between the ends of a 2 meter stick that is parallel to a uniform electric field is 400 V. The magnitude of the electric field is:
800 V/m
In a certain region of space the electric potential increases uniformly from east to west and does not vary in any other direction. The electric field:
points east and does not vary with position
If the electric field is in the positive x direction and has a magnitude given by E=Cx^2, where C is a constant, then the electric potential is given by V=:
-Cx^3 /3
The work required to carry a particle with a charge of 6.0 C from a 5.0 V equipotential surface to a 6.0 V equipotential surface and back again to the 5.0 V surface is:
0
The equipotential surfaces associated with a charged point particles are:
concentric spheres centered at the particle
The electric field in a region around the origin is given by E = C(xi + yj), where C is a constant. The equipotential surfaces in that region are:
concentric cylinders with axes along the z axis.
The electric potential in a certain region of space is given by V=-7.5x^2 + 3x, where V is in volts and x is in meters. In this region the equipotential surfaces are:
planes parallel to the yz plane
In the diagram, the points 1, 2 and 3 are all the same very large distance from a dipole. Rank the points according to the values of the electric potential at them, from the most negative to the most positive.
1, 3, 2
A particle with charge q is to be brought from far away to a point near an electric dipole. No work is done if the final position of the particle is on:
a line that is perpendicular to the dipole moment
Equipotential surfaces associated with an electric dipole are:
none of the above.
The diagram shows four pairs of large parallel conducting plates. The value of the electric potential is given for each plate. Rank the pairs according to the magnitude of the electric field between the plates, least to greatest.
2, 4, 1, 3
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