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Physics Tests > Chapters 22-24 > Flashcards

Chapters 22-24 Flashcards

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1
Q

A material which readily transmits current is called a(n)…..

A

conductor

Pg. 328

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2
Q

A production of charge by the influence of another charged body at a distance is called …..

A

induction

Pg. 330

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3
Q

Magnetizing a material by bringing it into the presence of an existing magnet is called magnetization by …..

A

induction

Pg. 342

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4
Q

The law of magnetic force was formulated by …..

A

Coulomb

Pg. 343

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5
Q

Materials which are strongly attracted by magnets are said to be ……

A

ferromagnetic

Pg. 347

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6
Q

Magnetic induction can be measured in any of the following units except …..

A

Magnetic induction can be measured in:
T(tesla) =N/A•m
T= Wb/m^2

Pg. 352, 355

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7
Q

The generation of current in a conductor moving in a magnetic field is called …..

A

electromagnetic induction

Pg. 359

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8
Q

Which of the following did Faraday not demonstrate by thrusting a bar magnet into a coil?

A

Faraday did demonstrate:
1. The mere presence of a magnetic field is not enough to induce current within a coil.
2. Current is induced within a coil by relative motion between the coil and a magnetic field.
3. The speed of the relative motion between a coil and a magnetic field determines how much current is produced.
4. The current induced by a magnetic field depends on the strength of the field.
5. The current varies directly with the number of turns in the coil.
Pg. 362

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9
Q

A device that produces current by electromagnetic induction is called a(n) …..

A

electromagnetic generator

Pg. 366

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10
Q

Completion

A(n) ….. is used for testing the charge of an object.

A

electroscope

Pg. 331

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11
Q

The only available charge carriers in a solid material are …..

A

electrons

Pg. 328

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12
Q

Any piece of magnetized rock is known as a(n) …..

A

lodestone

Pg. 341

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13
Q

When neighboring atomic dipoles orient themselves in the same direction and spread this orientation to other atoms a(n) ….. is formed.

A

domain

Pg. 346

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14
Q

When current flows through a liquid, ….. are the carriers of electrical charge.

A

atoms

Pg. 328

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15
Q

The SI unit of magnetic induction is the …..

A

Tesla

Pg. 344

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16
Q

A positive electrode of an electrochemical cell is called a(n) …..

A

cathode

Pg. 373

17
Q

A device in which two conductors come together at junctions but are maintained at different temperatures is called a(n) …..

A

thermocouple

Pg. 375

18
Q

A ….. crystal produces a potential difference between its opposite faces when a mechanical stress is applied to it.

A

piezoelectric

Pg. 376

19
Q

….. law states that induced current is directed so as to create a magnetic field that opposes the motion causing the current.

A

Lenz’s

Pg. 365

20
Q

True/False

The total charge on any insulated object or insulated system of connected objects is (conserved).

A

True

Pg. 333

21
Q

Lines of (flux) always originate in a positively charged body and terminate in a negatively charged body.

A

force

Pg. 334

22
Q

All charge is confined to the (surface) of a conductor.

A

True

Pg. 338

23
Q

Any charge on a (cubical) conductor is distributed uniformly over the exterior surface.

A

spherical

Pg. 338

24
Q

The material of a (permanent) magnet is easily magnetized and easily demagnetized.

A

temporary

Pg. 343

25
Q

(Decreasing) the temperature of a magnet destroys its ability to retain its magnetization.

A

Increasing

Pg. 342

26
Q

The needle of Oersted’s compass experiment moved when current was turned on or off in a wire running (parallel) to the original direction of the needle.

A

True

Pg. 348

27
Q

One difference between AC and DC generators is that an (AC) generator has a commutator.

A

DC

Pg. 368

28
Q

Electrochemical cells connected together constitute a (battery).

A

True

Pg. 374

29
Q

The voltage of cells in series is the (sum) of their separate voltages.

A

True

Pg. 374

30
Q

Matching

coulomb
current
Electric field strength
Electric potential 
Electric potential energy 
Voltage

The force exerted on a charge

Amount of work done in transporting total charge from the ground to a specified point

Amount of work done by an external force to move a unit of positive charge from point A to point B on a conductor

The total charge of 6.242 X 10 ^18 electrons

A

Matching

coulomb 
current
Electric field strength 
Electric potential 
Electric potential energy 
Voltage

The force exerted on a charge = electric field strength

Amount of work done in transporting total charge from the ground to a specified point = electric potential energy

Amount of work done by an external force to move a unit of positive charge from point A to point B on a conductor = electric potential difference

The total charge of 6.242 X 10 ^18 electrons = coulombs

31
Q

Equations

Calculates the magnetic force on a straight conductor

A 
F= BI(L)
Magnetic force
B= magnetic induction 
I= carrying current I
Lowercase L for length

Pg. 352

Pg. 352

32
Q

Equation

Calculates the magnetic force on a moving charge

A 
F= qvB
Magnetic force
q= charge's magnitude
B = magnetic induction
Pg. 354
33
Q

Short answer

Describe how an insulated, grounded metal sphere can be given a lasting positive charge by induction

A

An insulated, grounded metal sphere can be given a lasting positive charge through induction by holding a negatively charged rubber rod near the metal sphere; and the sphere will acquire a positive charge to counteract the negative charged rod near it. Once a positive charge is gained by the sphere the charge will stay even after the connection to the ground is broken and the rod is removed from its vicinity.
Pg. 330

34
Q

Describe how you can find the direction of magnetic force on moving charges by using the left-hand three-finger rule

A

With your left hand, point your thumb in the direction of negative current; your extended, straight index finger points in the direction of magnetic induction, and your bent middle finger shows the direction of magnetic force.
Pg. 353

35
Q

Name two ways we can increase the frequency of the current produced by an AC generator.

A

Two ways to increase the frequency of the current produced by an AC generator is by rotating the armature faster or by increasing the number of magnetic poles surrounding the armature.
Pg. 368

Physics Tests (11 decks)

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