Mr. Rogers' IB/AP Physics II: E&M Objectives

Syllabus 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter

AP Physics C E&M Standards

A. Electrostatics .....................................................................30%

1. Charge, field, and potential
2. Coulomb's law and field and potential of point charges
3. Fields and potentials of other charge distributions

a. Planar
b. Spherical symmetry *
c. Cylindrical symmetry *

4. Gauss's law *

Charge

Essential Question: How is charge similar and different than mass?

  1. Describe the nature of charge.
    • Like repel, opposites attract
    • Freely moves in conductors, not free in insulators
    • Conserved
    • Quantized
    • Analogous to mass in many equations
  1. Explain the difference in charging an object by induction and charging it by conduction.
  2. Calculate electrostatic forces using Coulomb's law.
    • One dimension
    • 2 Dimension
  1. For a hydrogen atom, calculate the ratio of electric to gravitational attraction forces.

 

Homefun: prob 1, 7, 9, 11 p.674-5 Serway

 

  

Demo: Van de Graaff Generator

Using the Van de Graaff Generator, demonstrate:

  • The nature of charge (see objectives)
  • induction
  • conduction

If the Van de Graaff Generator creates a voltage of on the order of magnitude of 100,000 volts, why is it not deadly?

 

 

 

Mini-Lab Physics Investigation (Requires only Purpose, data, and conclusion)
Title Investigation of the Ionizing Effects of UV Radiation
Purpose Can shielding prevent unwanted electric fields from producing noise signals in wires?
Overview Charge the electroscope and measure the length of time it takes for the leaves to come back together (indicating that the charge has been drained from the electroscope). Repeat this process several times and calculate an average time.

Repeat the first step except this time shine a UV light on the leaves.

Note: do not look directly at the UV light.
Data, Calculations Calculate a % difference between the UV and non UV cases for the time it takes to drain the charge off the electroscope. Use the averages of each in the calculation.
Questions, Conclusions
  1. Explain why the UV light does or does not affect the length of time it takes to drain the charge off the electroscope.
  2. Could an electroscope be used for indicating the presents of ionizing radiation?
Resources/Materials: Electroscopes, stop watches, UV radiation source

 

 

AP Physics C E&M Standards

A. Electrostatics (continued).....................................................................30%


1. Charge, field, and potential
2. Coulomb's law and field and potential of point charges
3. Fields and potentials of other charge distributions

a. Planar
b. Spherical symmetry *
c. Cylindrical symmetry *

4. Gauss's law *

Electric Field

Essential Question: How is knowledge of electric fields useful?
  1. State the general convention for the type of charge used in defining electrical phenomena.
  2. Define electric field and state how its equation is analogous to F = ma.
    • Map of force on a + test charge
    • E-field is a vector
    • F = q E
  1. Draw the electric field lines around point charges.
  2. State the meaning of the arrows and the spacing between lines in an electric field diagram.
  3. Use Coulomb's law to calculate the electric field around a point charge.
  4. Calculate the electric field due to a
  • thin concentric charged ring -- model: ring of point charges
  • concentric charged disk -- model: series of thin concentric rings
  • infinitely large flat surface  -- model: disk with and infinite radius

Homefun: prob 15, 19, 23, 41, 43 p.675-6 Serway

 

Video: Demonstration of Electrostatic Precipitators

Show video of an electrostatic precipitator demonstration.

Why would the electric field be particularly strong around a pointed electrode?

Why are lightning rods generally pointed?

 

 

Formal Physics Investigation
Title Millikan Oil-Drop Experiment
Purpose Determine the charge on an electron
Models Various
Overview Conduct the Millikan Oil-Drop Experiment according to the instruction sheet provided.
Safety Issues The experiment uses a high voltage source which can be a shock hazard
Equipment Limitations As always, the equipment is fragile.
Resources/Materials: Millikan Oil-Drop Experiment apparatus and high voltage power supply

 

 

Charged Particle Kinematics

Essential Question: How is the kinematics of charged particles used in TVs ?

  1. State the value of the e-field and force on a charged particle placed at any location above an infinitely large flat surface with a uniform charge.
  2. Solve kinematic problems for a charged particle in a uniform e-field.
  3. Solve projectile motion problems for a charged particle in a uniform e-field.
  4. Solve mechanical energy problems for a charged particle in a uniform e-field.

 

Homefun: prob 37, 45, 51, 53

Mini-Lab Physics Investigation (Requires only Purpose, data, and conclusion)
Title Beam strength vs. distance behavior of a microwave transmitter
Purpose Will a horn type microwave transmitter act like a point source and obey the inverse square law.
Overview

A horn type microwave transmitter is designed to transmit a beam of electromagnetic radiation. However, since microwaves can be modeled as a wave phenomenon they should tend to spread out as they propagate. at a sufficient distance the beam should spread out enough so that the microwaves' intensity begin to obey the inverse square relationship.

Place the microwave source on the floor and align it with the receiver at various distances across the room measure the relative beam intensity and draw a graph of relative intensity vs. distance.
Data, Calculations Perform linear and power regression analysis to determine if an inverse square law relationship exists in the data. Use residuals to gauge whether a given regression equation is appropriate.
Questions, Conclusions
  1. How can you test the receiver and transmitter for alignment?
  2. How does the electric field of the transmitter differ from the electric field of a point charge?
  3. Does the microwave transmitter create a magnetic field as well as an electric field?
Resources/Materials: Microwave transmitter and receiver.

 

IB BIOMEDICAL PHYSICS PART 1 - MECHANICAL FACTORS: FORM OF ANIMALS

Essential Question: Why is the design of an animal related not just to its function but also its size?

1) Describe 3 ways to characterize a "solid" object.

2) Define scale up factor.

3) Develop a general scale up relationships for the 3 characteristics of solid objects.

4) Describe the key variable in an animal's weight and tell why it is not density.

5) State the key factor in a warm blooded animal's heat loss.

6) Describe the relationship between heat loss and food intake.

7) Describe the key factors in respiration.

8) State the relationship between the compressive strength of legs and the key shape factor.

9) State why animals can not be scaled up and down by large factors.

10) Analyze an animal's form using a knowledge of scale up factors.

FLUIDS
Essential Question: How does hieght affect an animals circulatory system?

11) Be as one with the deeper meaning of pressure.

12) Solve problems with Pascal's Law.

13) Be as one with the deeper meaning of density.

14) Solve problems by calculating pressures given the height of a liquid column.

15) Correctly use the terms streamline, laminar flow, and turbulent flow.

16) Use the Bernoulli equation to solve problems.

Homefun: Work the Scale Up Factors Problems

AP Physics C E&M Standards

A. Electrostatics (continued).....................................................................30%


1. Charge, field, and potential
2. Coulomb's law and field and potential of point charges
3. Fields and potentials of other charge distributions

a. Planar
b. Spherical symmetry *
c. Cylindrical symmetry *

4. Gauss's law *

Chapter 24

Gauss's Law

Essential Question: Why is it sometimes necessary to shield against electric fields?

  1. Define electric flux.
  1. State the relationship between electric flux through a closed surface and the enclosed charge.

 

Homefun: Questions 1-7 p.699; Problems 1, 3, 7 p. 700

 

E-Fields in and around: planes, non-conductive
spheres, conductive spheres, and cylinders
  1. Solve for the electric flux created by a point charge through an infinitely large plane.
  2. Solve for the electric flux created by a point charge next to finite sized plane.
  3. Using Gauss's law derive the E-field around a point charge.
  4. Derive an expression for the electric field inside and outside a charged "fuzzy" sphere.
  5. State the electric field inside a conductor in electrostatic equilibrium.
  6. Derive an expression for the E-field inside and outside a charged hollow sphere.
  7. Derive an expressions for the E-field inside and outside both very long fuzzy cylinders and conductive cylinders.

 

Homefun: Problems 11, 15, 27 p. 700

 

  

Demo: Shielding
  1. Turn on a transistor radio and place it a  atop a clean paint can lid.
  2. Slowly lower a clean empty paint can over the radio until the can contacts the lid.

Why does the radio lose its signal?

How is does the radio and can  demo different from the Gauss's Law analysis of shielding?
 
E-Fields in and around: planes, non-conductive spheres, conductive spheres, and cylinders
  1. Be as one with the info in table 24.1 p. 697.
  2. Be as one with the four magic box points on pages 693, 694.
  3. Derive an expressions for the E-field inside and outside both fuzzy and conductive concentric spheres.
  4. Derive an expressions for the E-field inside and outside both fuzzy and conductive concentric cylinders.

Homefun: Problems 31, 39, 51 p. 700

 

Mini-Lab Physics Investigation (Requires only Purpose, data, and conclusion)
Title Investigation of Shielding Effectiveness
Purpose Can shielding prevent unwanted electric fields from producing noise signals in wires?
Overview Wrap about 3 feet of unshielded single conductor wire into a coil about 10 inches in diameter. connect the two ends to an oscilloscope and place the coil atop a similar sized coil of an extension cord plugged into the wall. Observe the noise signal picked up by the single conductor wire.

Wrap an aluminum foil shield around the single conductor wire and connect one end of it to the oscilloscope's ground. Again observe the noise signal.
Data, Calculations Record your observations
Questions, Conclusions
  1. What does Gauss's Law indicate about the e-field inside a charged conductive surface in electrostatic equilibrium?
  2. How does the above situation relate to the conditions of the experiment? What is different?
Resources/Materials: Microwave transmitter and receiver.

 

 

Mr
 

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