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Terms in this set (21)
A dipole is held motionless in a uniform electric field. When the dipole is released, which of the following describes the subsequent motion?
The dipole rotates clockwise
An electron is moved from near the positive plate to the negative plate in doing this it..
gains potential energy
Two spherical conductors are separated by a large distance. They each carry the same positive charge Qa=Qb=Q. Conductor A has a larger radius than conductor B. Compare the potential, Va, at the surface of conductor A with a potential, Vb, at the surface of conductor B.
Va less tha Vb
Apply heat to a copper wire and the resistance of the wire will ?
Increase
The copper wire is stretched so that its length increases and its diameter decreases. As a result,
the resistance of the wire will incrrease
what is the current in the fourth wire
2 A to the left
(sum of current into junction)
how does current I1 in segment 1 compare to current i2 in segment 2?
I1 equal to I2
conversion of current
A and B are identical light bulbs connected to a battery as shown.
Which is brighter?
The bulbs are equally bright
Consider the two point charges in a parallel plate capacitor, They have equal positive charges. Which has more electric potential energy?
Charge A
A negatively charged ball is moving from a higher voltage region to a lower voltage region.
What happens to the speed of the ball as it moves to the right?
Slows down
Metal spheres 1 and 2 are touching. Both are initially neutral.
1. A positively charged rod is brought near sphere 1.
2. The two spheres are then separated while the charged rod is still in place.
3. The charged rod is then removed.
• Afterward, what are the charges on the two spheres?
Q1 is - and Q2 is +
Apply heat to a copper wire and the resistance of the wire will?
increases.
A copper wire is stretched so that its length increases and its diameter decreases. As a result,
The resistance of the wire increases
Consider two negative charges, -8 nC and -6 nC as shown below. What is the direction of the net electric field at a point halfway between them, marked by an X?
To the left
What things can you say, for sure, are the same for all three resistors in this circuit?
Potential difference, ∆V
What is the potential difference, ΔV, across the 3.0 Ω resistor?
6 V
Two spherical conductors are separated by a large distance. They each carry the same positive charge QA = QB = Q. Conductor A has a larger radius than conductor B.
Compare the potential, VA, at the surface of conductor A with the potential, VB, at the surface of conductor B.
VA less than VB
What does the voltmeter read?
6 V
What things can you say, for sure, are the same for all three resistors in this circuit?
Current, I
n the situation below, as the positively charged object moves to the right, it
Loses Potential Energy
An electron is moved from near the positive plate to the negative plate. In doing this, it
Gains Potential Energy
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Verified questions
PHYSICS
A car has a gas tank that holds 12.5 U.S. gal. Using the conversion factors from the inside front cover, (a) determine the size of the gas tank in cubic inches. (b) A cubit is an ancient measurement of length that was defined as the distance from the elbow to the tip of the finger, about 18 in. long. What is the size of the gas tank in cubic cubits?
PHYSICS
Coulomb measured the deflection of sphere A when spheres A and B had equal charges and were a distance, r, apart. He then made the charge on B one-third the charge on A. How far apart would the two spheres then have had to be for A to have had the same deflection that it had before?
PHYSICS
A convenient and compact way of expressing multiparticle states of antisymmetric character for many fermions is the Slater determinant: $$ \begin{matrix} \Psi_{n 1}(x 1) ms_1 & \Psi_{\mathrm{n} 2}\left(x_{1}\right) \mathrm{ms}_2 & \Psi_{n 3}(x 1) ms_3 & \Psi_{\mathrm{nN}}(x_1) \mathrm{ms}_N\\ \Psi_{\mathrm{n}1}(x_2) \mathrm{ms}_1 & \Psi_{\mathrm{n}2}(x_2) \mathrm{ms}_2 & \Psi_{n 3}( x_2) m s_3 & \Psi_{\mathrm{nN}}(x_2) \mathrm{ms}_N\\ \Psi_{\mathrm{n}1}(x_3) \mathrm{ms}_1 & \Psi_{\mathrm{n}2}(x_3) \mathrm{ms}_2 & \Psi_{n 3}( x_3) m s_3 & \Psi_{\mathrm{nN}}(x_3) \mathrm{ms}_N\\ \cdot & \cdot & \cdot & \cdot\\ \Psi_{\mathrm{n}1}(x_N) \mathrm{ms}_1 & \Psi_{\mathrm{n}2}(x_N) \mathrm{ms}_2} & \text{\Psi_{n 3}( x_N) m s_3 & \Psi_{\mathrm{nN}}(x_N) \mathrm{ms}_N\\ \end{matrix} $$ It is based on the fact that for N fermions there must be N different individual-particle states, or sets of quantum numbers. The ith state has spatial quantum numbers (which might be ni; $\ell i$ and $m \ell i)$ represented simply by ni*and spin quantum number msi. Were it occupied by the $\psi_{n1}(x_j)ms_i$ A column corresponds to a given state and a row to a given particle. For instance, the first column corresponds to individual-particle state $\psi_{n1}(x_j)ms_1$ where j progresses (through the rows) from particle I to particle N. The first row corresponds to particle 1, which successively occupies all individual-particle states (progressing through the columns).(a) What property of determinants ensures that the multiparticle state is 0 if any two individual-particle states are identical?(b) What property of determinants ensures that switching the labels on any two particles switches the sign of the multiparticle state?
PHYSICS
The CGS unit for measuring the viscosity of a liquid is the poise (P): $1 \mathrm{P}=1 \mathrm{g} /(\mathrm{s} \cdot \mathrm{cm})$. The SI unit for viscosity is the $\mathrm{kg} /(\mathrm{s} \cdot \mathrm{m})$. The viscosity of water at $0^{\circ} \mathrm{C}$ is $1.78 \times 10^{-3} \mathrm{kg} /(\mathrm{s} \cdot \mathrm{m})$. Express this viscosity in poise .
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