What situations are studied in electrostatics?

What is electric charge? How many types of charge exist and what forces can they create?

Know the basic structure of the atom: proton, neutron, electron; small, dense, nuclear model.

Know the principle of "conservation of charge."

Why does a metal conduct electricity?

Why does an insulator not conduct electricity?

Know Franklin's view of electricity.

Know the principles of charging by friction, contact and induction.

How does an electroscope detect the presence of net charge?

How was the dependence of Force on amount of charge and distance between the objects determined? Who determined it?

kq₁q₂

Coulomb's law F = ---------- r Know how to add force vectors.

r²

Is there any similarity between the electric field concept and the gravitational field concept?

What is a test charge?

kq

Electric Field E = F/q_o OR E = ------- r

r²

Know how to do vector addition of forces and E fields using the component method.

Know how to draw electric field lines and know what they signify (magnitude of E and direction).

What is true concerning the value of the electric field inside a conductor (for electrostatics)?

Where does excess charge reside on a metal object (for electrostatics)?

How is an electric field line drawn at the surface of a conductor (for electrostatics)?

Motion in electric field calculate force in x,y calculate acceleration in x, y

use 4 equations of constant acceleration

You are invited to read section 16-10 but it will not be discussed in detail in class and will not be covered on the test.

PHY162

What is the fundamental unit of charge?

Who determined the value of the charge on the electron?

What is electric flux?

Know the concept of Gauss’s law for electrostatics.

What is a Gaussian surface? Gauss’s Law Electric Flux = Q

Know how to derive Coulomb’s law from Gauss’s law.

Chapter 17 Electric Potential, Energy, Capacitance

Electrical problems can be solved using energy concepts instead of vectors. This concept was used during the first semester of this course and will be used again now.

W_BA / q= V_BA V_BA is the potential difference between locations A and B

V_BA = V_B - V_A Potential difference can be called "voltage."

Where is V equal to zero?

Does the location where V = 0 make a difference in solving problems?

Know the difference between electric potential and potential energy.

What is the relation of battery terminals and potential difference?

If the electric field is uniform (constant) then V_BA = Ed

What are equipotential lines and surfaces?

Do lines of equipotential stop or start on a charged object?

When and Why do we say that the surface of a conductor is an equipotential surface?

Know the relation (orientation) of electric field lines to lines of equal electric potential.

How is the electron volt (eV) defined? Why is it used? Is it a unit of energy or power or potential, etc.?

kq

point charge V = ---- V à 0 when r à infinity

PE = --------- Two charges have an associated value of potential energy.

r

What constitutes an electric dipole?

How does an electric field affect an electric dipole?

Chapter 17 continued

What is a capacitor and what is it’s purpose? q = CV C = e _o A / d

Know how to calculate the capacitance of a parallel plate capacitor.

Does the capacitance value change as the voltage applied to the capacitor changes?

Be able to sketch the electric field in the vicinity of a parallel plate capacitor.

Why does a dielectric, which is inserted between the plates of a capacitor, change the capacitance value? C = k e _o A/d

Why is the dielectric strength an important characteristic of a dielectric?

Why do we say that energy is stored in a capacitor? U = 0.5CV²

What is the relationship between energy density and the electric field?

Section 17-10

What are cathode rays?

What is a CRT?

Section 17-11

What does an EKG detect?

PHY 162

Know the steps in the integration of ring of charge to find E on the axis.

Be able to use Gauss's law to find the electric field due to:

a point charge an infinite plane of charge

an infinite line of charge a cylindrical shell of charge

a solid sphere of charge a charged metal object

How does a battery produce electricity?

What is the purpose of a battery?

How many electric cells are in a battery?

We will not cover the details of the chemical reactions in a battery.

Know the definition for

circuit current Ampere

direct current dc conventional current

resistance When is Ohm’s law valid?

Know a situation in which Ohm’s law is not valid.

resistor resistivity

What factors are important in determining the resistance for a piece of material?

Does resistivity usually increase or decrease as the temperature of the material increases?

How is power calculated in an electric circuit? What is Joule heating?

Know the basic principles of home power distribution: parallel circuits, fuses or circuit breakers, safety

What is alternating current (AC)?

What is the difference between peak and rms values? Which is used to compare AC and DC circuits?

current I = q/t Ohm's law V = IR

resistance of a wire R = ------ P = IV P = I²R

tables will be given