Item Ics 1 Sem1 Block 8 EM Fields

Item Ics 1 Sem1 block 8 EM fields

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8.1 Cover ICS1Sem1Block8 Physics 5 d, e, h, i, j, m
To be accepted for grading it must be in order and signed
Please go through the paper work with your student.
Test and packet due on 12/3 period 5 12/4 all even periods 12/5 period 3 and 7
Assignment list
8.1 Cover
8.2 WCW
8.3.1 Standards fill in blank
8.3.2 Standards Questions
8.4 Vocabulary
8.5.1 notes transistors
8.5.2 notes Charge and E-field
8.5.3 notes EM induction
8.5.4 notes Plasma
8.6.1 worksheet Transistors
8.6.2 worksheet Charge and E-field
1 Static Electricity Lightning
2 Static Electricity crossword
8.6.3 worksheet EM induction
1 Electric Current
2 What is magnetism?
3 Magnetic field of Earth
8.6.4 worksheet Plasma
8.7 Study guide and CST prep

Objective

The electromagnetic force is one of only four fundamental forces; the others are the gravitational force, strong and weak nuclear forces. Many devices, such as household appliances, computers, and equipment for communication, entertainment, and transportation, were developed from electromagnetic phenomena. Students should understand the concepts of motion, forces, and conservation of energy. Students should be acquainted with both Newton’s law, Coulomb’s law and that they describe forces that diminish as the square of distance. Understand how Transistors are used as gates and amplifiers.

Language Objective

Use the vocabulary words appropriately. Explain the similarities and differences between Electric and Magnetic fields. Use phrases such as perpendicular oscillation, direction of motion, Coulomb’s Law, induction of field, and transistors appropriately. Describe the potential energy and its connection with the Electric Field of a charged particle. Use the terms ions, electrons, field, force, inverse and “lines of force” when appropriate.

Copy PH 5 d, e, h, i, j, m below

PH 5 d
PH 5 e
PH 5 h
PH 5 i
PH 5 j
PH 5 m

8.2 WCW Fill in

Warm-up 1
Newton’s law Coulomb’s law

If I ______the distance between the objects, the force decreases by ______. If I ______the distance between the objects, the force increases by ______. If I ______each of the masses or charges’ of the objects, the force increases by______. If I ______each of the masses or charges’ of the objects, the force decreases by______. / Critical thinking 1
volt joule(2) potential difference coulomb
1.6×10−19______(symbol J). By definition, it is the amount of energy gained by the charge of a single electron moved across an electric ______of one ______. Thus it is 1 volt (1 j_____ per c______, 1 J/C) multiplied by the electron charge (1 e, or 1.6 x 10−19 C).
Wrap-up 1
The subject of energy transport by waves is important:
(1) ______occurs in definite, discrete amounts
(2) Charge comes in ______varieties or polarities:
positive and negative, neutral
(3) The smallest amount of observable charge is the charge on a(n) ______(or a proton).
Fill in blank using: electron, two, charge
Warm-up 2electromagnetic field, EMF or EM field is produced by moving charged objects. The electric field is produced by stationary charges and the magnetic field by moving charges “currents”; i.e. the two are the sources of the field.
Charge to Charge
Right Hand Rule / Critical thinking 2The behavior of the electromagnetic field can be resolved into four different
parts of a loop, the electric and magnetic fields
1 are ______by electric charges
2 ______with each other
3 ______forces on electric charges
4 the electric charges ______in space
fill the blanks with: move, interact, generated, produce
Wrap-up 2
Current, generate, interact, changing, loop, perpendicular, repeats
1 charged particles ______electric, (in motion magnetic fields)
2 fields ______with each other
3 changing electric field acts like a ______, generating 'vortex' of magnetic field
4 Faraday induction: ______magnetic field induces (negative) vortex of electric field
5 Lenz's law: negative feedback ______between electric and magnetic fields
6 fields act upon particles,
- Lorentz force: force due to electromagnetic field
- electric force: same direction as electric field
- magnetic force: ______both to magnetic field and to velocity of charge
7 particles move current is movement of particles
8 particles generate more electric and magnetic fields; cycle ______
Warm-up 3 Plasma -state of matter similar to gas, a portion of the particles are ionized (______). Heating a gas may ionize its molecules or atoms (reduce or increase the number of electrons in them), thus turning it into a plasma, which contains positive ions and negative electrons or ions. Ionization can be ______by other means, such as strong ______with a laser or microwave generator, and is accompanied by the dissociation of molecular bonds. Neon signs, lasers, stars, most of the universe / Critical thinking 3
If a gas is heated, at a sufficiently high temperature, the electrons will separate to form free electrons and positive ions. This is plasma. If some of the electrons leave the atom then some electrons are left on the atom. Why is the atom missing some electrons considered a positive ion?
Wrap-up 3 The common states of matter on Earth: ______In the Universe, the common state of matter is ______. Heat a solid element and it melts, heat the resulting liquid further and it turns to gas. In all three states, the atoms of the original solid are still held together by the ______attraction between the nucleus and the surrounding electrons. However if this gas is heated further, at a sufficiently high temperature, the electrons will separate to form free ______and positive ______.

8.3.1 Standards Fill in

5. d. Students know the properties of transistors and the role of transistors in electric circuits.
Semiconductors electrons temperature rises transistor current voltage
Amplifiers vacuum tubes
______are materials with an energy barrier such that only ______with energy above a certain amount can “flow.” As the ______, more electrons are free to move through these materials. A______is made of a combination of differently “doped” materials arranged in a special way. Transistors can be used to control large ______output with a small bias ______. A common role of transistors in electric circuits is that of an ______. In that role transistors have almost entirely replaced ______that were widely used in early radios, television sets, and computers.
5. e. Students know charged particles are sources of electric fields and are subject to the forces of the electric fields from other charges.
Electrostatic force magnitude gravitational force gravity electricity inversely
Coulomb’s law units for charge electric field presence of charges field test charge
distribution
______represents an interaction across space between two charged bodies. The ______of the force is expressed by a relationship similar to that for the ______between two bodies with mass. For both ______and ______, the force varies ______as the square of the distance between the two bodies. For two charges q1 and q2 separated by a distance r, the relationship is called ______,
F = kq1q2/r 2 where k is a constant. Customary ______are coulombs (C), in which case
k = 9 × 109Nm2/C 2. An ______is a condition produced in space by the ______. A ______is said to exist in a region of space if a force can be measured on a test charge in the region. Many different and complicated distributions of electric charge can produce the same simple motion of a ______and therefore the same simple field; for that reason it is usually easier to study first the effect of a model field on a test charge and to consider only later what ______of other charges might produce that field.
5. h. Students know changing magnetic fields produce electric fields, thereby inducing currents in nearby conductors.
induction create sources conductor induced current Lenz’s law
The concept of electromagnetic ______is based on the observation that changing magnetic fields ______electric fields, just as changing electric fields are ______of magnetic fields. In a______these induced electric fields can drive a current. The direction of the ______is always such as to oppose the changing magnetic field that caused it. This principle is called ______.
5. i. Students know plasmas, the fourth state of matter, contain ions or free electrons or both and conduct electricity.
Plasma positive neutral disassociate fourth state
A ______ is a mixture of ______ions and free electrons that is electrically ______on the whole but that can conduct electricity. A plasma can be created by very high temperatures when molecules ______and their constituent atoms further break up into positively charged ions and negatively charged electrons. Much of the matter in the universe is in stars in the form of plasma, a mixture of electrified fragments of atoms. Plasma is considered a ______of matter, as fundamental as solid, liquid, and gas.

8.3.1 Standards Fill in

5. j.* Students know electric and magnetic fields contain energy and act as vector force fields.
E B vector magnitude direction do not change from matter start positive charges end negative charges closed loops terminal points
from north pole entering south pole different sources in matter point charges
point dipoles no magnetic monopoles away positive charge
toward negative charge right-hand rule potential energy work
Both the electric field ____ and the magnetic field _____ are ______fields; therefore, they have a ______and a ______. The fields from matter whose distributions in space and in velocity ______with time are easy to visualize; for example, charges fixed in space, steady electric currents in wires, or permanent magnets. Electric fields ______like this are generally represented by “lines of force” that ______on ______and ______on ______but never form closed loops (see Standard 5.m*, which appears later in this section). In contrast, the lines for magnetic fields always form ______; they never start and end—magnetic field lines do not have ______. Even the magnetic field lines around simple bar magnets, which are typically drawn as emanating ______the ______and ______the ______, in fact continue through the body of the magnet to form closed loops.
The reason magnetic fields form loops while electric fields do not has to do with their ______at rest. Electric fields come from ______, and magnetic fields come from ______, which are more complicated; no sources of magnetic field with the simple properties of charge—that is, ______are known to exist. The direction in which an electric field points along a line of force is ______from ______and ______; the direction in which a magnetic field (that is due to a current) points along a closed loop can be found by the ______(see Standard 5.g, which appears earlier in this section).
Electric and magnetic fields are associated with the existence of ______. The fields are usually said to contain energy. For example, the potential energy of a system of two charges q1 and q2 located a distance r apart, is given by PE = k q1 q2 / r In general, the potential energy of a system of fixed-point charges is defined as the ______required to assemble the system bringing each charge in from an infinite distance.
5. m.* Students know static electric fields have as their source some arrangement of electric charges.
static any set smooth curves electric potential perpendicular high low to path positive net summing geometry calculus
The existence of a ______electric field in a region of space implies a distribution of charges as the source. Conversely, ______of charges or charged surfaces sets up an electric field in the space around the charge. The customary first step in visualizing an electric field is to draw ______, each of which contains only points of equal ______. Electric field lines (“lines of force”) can then be drawn as curves that are everywhere ______to the curves of equal potential. Electric field lines are assigned a direction that runs from regions of ______potential to ______and, therefore, from positive point charges ______negative ones. The lines of force represent the ______a particle with a small ______charge would take if released in the field.
At each point a ______vector E is obtained by ______the vector contributions from each charge. This process can be readily done for a two-charge system in which the ______is relatively simple. For more complicated distributions the methods of ______are generally required to obtain the field.

8.3.2 Standards Questions

1. How does a temperature rise, help more electrons to move through Semiconductor materials easier?

2. Amplification depends on the change in the transistor’s resistance caused by an input signal.

How does resistance influence amplification?

3. Are charged particles sources of electric fields?

4. Are charged particles subject to the forces of the electric fields from other charges?

5. What does the Electrostatic force represent?

6. What relationship is like the magnitude of the force?

7. What does the force inversely depend upon?

8. What are the three force variables?

9. What is the relationship called that gives force as a function of three variables?

10. What does k stand for? Give value.

11. What must be present to create an electric field?

12. A field is said to exist in a region of space if a ______can be measured on test charge in the region.

13. Why is it easier to study first the effect of a model field on a test charge and to consider only later what distribution of other charges might produce that field?

14. Do changing magnetic fields produce electric fields?

15. Can changing magnetic field produce current in a nearby conductor?

In a conductor induced electric fields can drive a current. The current flows in the direction of your right thumb then magnetic field flows in the path of you curling______

17. The direction of the induced current is always ______the changing (fill in the rest)______.

18. The induced current, opposite the changing magnetic field is known as ______law.

Plasmas are known as the fourth state of matter, because they are not a solid, liquid, or gas but a group of atoms that have lost an electron therefore having a positive charge and are called _____

Why can plasma conduct electricity?

Both the electric field E and the magnetic field B are vector fields; therefore, they have a ______and a direction.

Electric fields from matter are generally represented by “lines of force” that start on ______charges and end on ______charges but never form ______loops.

In contrast, lines for magnetic fields always form ______loops; they ______start and end—magnetic field lines do not have terminal points.

Electric fields come from point ______while Magnetic Fields come from point______

25. Electric and magnetic fields are associated with the existence of potential energy. The fields are usually said to contain energy. The potential energy of a system of two charges q1 and q2 located a distance r apart, using constant k, is given by