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Chapter 22
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Gravity
Terms in this set (43)
An electric field is most directly related to:
the force acting on a test charge.
As used in the direction of electric field, a "test charge":
none of the above
Experimenter A uses a test charge q(nought) and experimenter B uses a test charge -2q(nought) to measure an electric field produced by stationary charges. A finds a field that is:
the same in both magnitude and direction as the field found by B
The units of the electric field are
N/C
The units of the electric field are
J/(C*m)
Electric field lines:
are none of the above
Two thin spherical shells, one with radius R and the other with radius 2R, surround an isolated charged point particle. The ratio of the number of field lines through the larger sphere to the number through the smaller is:
1
A certain physics textbook shows a region of space in which two electric field lines cross each other. We conclude that:
the author made a mistake
Choose the correct statement concerting electric field lines:
field lines are close together where the field is large
The diagram shows the electric field lines due to two charged parallel metal plates. We conclude that:
A proton at X would experience the same force if it were placed at Y.
Let k denote 1/4π ε0. The magnitude of the electric field at a distance r from an isolated point particle with charge q is:
kq/r^2
The electric field at a distance of 10 cm from an isolated point particle with a charge of 2 x 10^-9 C is:
1800 N/C
An isolated charged point particle produces an electric field with a magnitude E at a point 2 m away from the charge. A point at which the field magnitude is E/4 is:
4 m away from the particle.
An isolated charged point particle produces an electric field with magnitude E at a point 2 m away. At a point 1 m from the particle the magnitude of the field is:
4E
Two protons (p1 and p2) are on the x axis, as shown below. The directions of the electric field at points 1, 2 and 3, respectively, are:
<--, <--, -->
Two point particles, with charges of q1 and q2, are placed a distance r apart. The electric field is zero at a point P between the particles on the line segment connecting them. We conclude that:
q1 and q2 must have the same sign but may have different magnitudes.
The diagrams below depict four different charge distributions. The charge particles are all the same distance from the origin. The electric field at the origin:
is zero for situation 4
The diagram shows a particle with positive charge Q and a particle with negative charge -Q. The electric field at point P on the perpendicular bisector of the line joining them is:
up
The diagram shows two identical particles each with positive charge Q. The electric field at point P on the perpendicular bisector of the line joining them is:
to the right
Two point particles, one with charge +8 x 10^-9 C and the other with charge -2 X 10^-9 C, are separated by 4 m. The electric field in N/C midway between them is:
22.5
Two charged point particles are located at two vertices of an equilateral triangle and the electric field is zero at the third vertex. We conclude:
at least one other charged particle is present
Two point particles, with the same charge, are located at two vertices of an equilateral triangle. A third charged particle is placed so the electric field at the third vertex is zero. The third particle must:
be on the perpendicular bisector of the line joining the first two charges.
Positive charge Q is uniformly distributed on a semicircular rod. What is the direction of the electric field at point P, the center of the semicircle?
to the right
Positive charge +Q is uniformly distributed on the upper half a semicircular rod and negative charge -Q is uniformly distributed on the lower half. What is the direction of the electric field at point P, the center of the semicircle?
down
Positive charge +Q is uniformly distributed on the upper half a rod and negative charge -Q is uniformly distributed on the lower half. What is the direction of the electric field at point P, on the perpendicular bisector of the rod?
down
The electric field due to a uniform distribution of charge on a spherical shell is zero:
only inside the shell
A charged particle is placed in an electric field that varies with location. No force is exerted on this charge:
at locations where the electric field is zero
The magnitude of the force of a 400 N/C electric field on a 0.02 C point charge is:
8.0 N
A 200 N/C electric field is in the positive x direction. The force on an electron in this field is:
3.2 x 10^-17 N in the negative x direction
An electron traveling north enters a region where the electric field electric field is uniform and points north. The electron:
slows down
An electron traveling north enters a region where the electric field is uniform and points west. The electron:
veers east
Two charged particles are arranged as shown. In which region could a third particle, witch charge +1C, be placed so that the net electrostatic force on it is zero.
I only
An electric dipole consists of a particle with charge of +6 x 10^-6 C at the origin and a particle with a charge of -6 x 10^-6 C on the x axis at the x = 3 x 10^-3 m. Its dipole moment is:
1.8 x 10^-8 C * m in the negative x direction
The force exerted by a uniform electric field on a dipole is:
none of the above
An electric field exerts a torque on a dipole only if:
the field is not parallel to the dipole moment
The torque exerted by an electric field on a dipole is:
perpendicular to both the field and the dipole moment.
Diagram shows four possible orientations of an electric dipole in a uniform electric field. Rank them according to magnitude of the torque exerted on the dipole by the field, least to greatest.
1, 2 and 4 tie, then 3
A uniform electric field of 300 N/C makes and angle of 25 degrees with the dipole moment of an electric dipole. If the torque exerted by the field has a magnitude of 2.5 x 10^-7 N*m, the dipole moment must be:
2.0 x 10^-9 C * m
When the dipole moment of a dipole in a uniform electric field rotates to become more nearly aligned with the field:
the field does positive work and the potential energy decreases
The dipole moment of a dipole in a 300 N/C electric field is initially perpendicular to the field, but it rotates so it is in the same direction as the field. If the moment has a magnitude of 2 x 10^-9 C*m, the work done by the field is:
6 x 10^-7J
An electric dipole is oriented parallel to a uniform electric field. It is rotated to one of the five orientations shown below. Rank the final orientations according to the change in the potential energy of the dipole-field system, most negative to most positive.
1, 2, 3, 4
The purpose of Milliken's oil drop experiment was to determine:
the charge of an electron
A charged oil drop with a mass of 2x10^-4 kg is held suspended by a downward electric field of 300 N/C. The charge on the drop is:
-6.5x10^-6 C
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