Chapter 22
Draw the electric field of a point charge if it is positively charged. (Be sure to demonstrate what happens when we get farther away from the point charge)
Need to have correct vector direction, must be perpendicular to point charge, and needs to show that the farther away from the point charge you get the electric field decreases in magnitude.
( I need to draw the figure ) What is the direction of the electric field at the dot?
D
How should the integral in Gauss's law be evaluated?
Over a closed surface.
( I have to draw the figure ) Two positive charges are equal. Which has more electric potential energy?
Charge A.
What are the units for Electric Potential Energy?
J, Joules
Metal spheres 1 and 2 are touching. Both are initially neautral, the charged rod is brought near, the spheres are separated, the charged rod is then removed. What are the charged of Q1 and Q2?
Q1 = -
Q2 = +
What are the 4 key electric fields? (There are the only electric fields you will be tested on).
A point charge, an infinitely long line of charge, an infinitely wide plane of charge, a sphere of charge.
( I need to draw it) What side has the largest flux threw it?
They are equal.
(I need to draw the figure) A positive charge moves as shown. Its kinetic energy does what?
Decreases
What are the units for Electric Potential?
V, Volts
Charged glass and plastic rods hang by threads. An object attracts the glass rod. If this object is then held near the plastic rod what will it do.
Either attract or repel.
There is a single electron at a distance from the point charge. What do you need to find the force on the electron?
Distance between positive charge and the electron, the charge on the electron, and the charge of the positive charge.
-5
If a positive charge is released from rest, it moves in the direction of:
A stronger electric field, a weaker electric field, higher electric potential, lower electric potential, both a stronger field and higher potential, or both a weaker field and lower potential?
Lower electric potential.
What does lambda stand for?
Linear charge density
Two 1.9 kg masses are 1.5 m apart (center to center) on a frictionless table. Each has + 9.0 μC of charge. What is the magnitude of the electric force on one of the masses?
0.32 N
The electric field strength 5.0 cm from a very long charged wire is 2600 N/C. What is the electric field strength 10.0 cm from the wire?
1300 N/C
A 6.0 cm × 4.5 cm rectangle lies in the xz-plane. What is the magnitude of the electric flux through the rectangle if E =(100i −200j) N/C?
0.54 N⋅m^2/C
What is the speed of an electron that has been accelerated from rest through a potential difference of 960 V ? Write answer how you should enter it in the testing center.
1.84E7 m/s
What does eta stand for?
Surface charge density.
( I need to draw the figure ) Determine the magnitude of the force F on the 1.0 nC charge. Write your answer how you should enter it in the testing center.
1.8E−4 N
A parallel-plate capacitor is formed from two 8.5 cm diameter electrodes spaced 2.8 mm apart. The electric field strength inside the capacitor is 3.0E6 N/C. What is the charge (in nC) on each electrode?
150
The electric field strength just above one face of a copper penny is 1740 N/C . What is the surface charge density on this face of the penny? Write answer how you should enter it in the testing center.
1.54E10-8 C/m^2
An electron with an initial speed of 4.50×105 m/s is brought to rest by an electric field.
-0.576 V
What is the difference between Q and q?
For this class, nothing.