Chapter 4 Flashcards

(37 cards)

1
Q

The lines of flux run ______ the magnet AND ______ the magnet

A

Through/Outside

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2
Q

The stronger the magnetic field the _____ lines of flux

A

More

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3
Q

Lines of flux(force) flow N to S ____ the magnet and S to N ____ the magnet

A

Outside/Through

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4
Q

Example of a natural magnet

A

Lodestone

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5
Q

Example of a artificial magnet

A

Alnico (Aluminum, Nickle, Cobalt)

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6
Q

Electromagnet temporary produced by moving electric

A

Current

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7
Q

any flow of current produces a _____ field

A

Magnetic

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8
Q

When current stops ______ collapses

A

Magnetic Field

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9
Q

Law of Magnetism: Repulsion-Attraction

A

Like poles repel, unlike poles attract

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10
Q

Law of Magnetism: Inverse Square Law

A

Two magnetic fields directly proportional to magnitude.
Inversely Proportional to square of distance

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11
Q

Law of Magnetism: Magnetic Poles

A

Magnet has two poles no matter how divided poles continue to exist

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12
Q

highly permeable, greatly susceptible to induction
EX: ALNICO

A

Ferromagnetic

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13
Q

Low permeability, Weak attraction
EX: Platinum, Aluminum

A

Paramagnetic

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14
Q

Weakly repelled by all magnetic fields
EX: Beryllium, bismuth

A

Diamagnetic

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15
Q

Not affected by magnetic fields
EX: Wood, Glass, rubber

A

Nonmagnetic

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16
Q

Responsible for findings of Deflection of a compass/magnetic field

17
Q

Factors governing effectiveness of solenoids & Electromagnet

A
  1. Diameter’
  2. Length
  3. Current
18
Q

Discovered magnetic lines of force & wire must have motion relative to each other to induce an electrical current

A

Micheal Faraday

20
Q

Ways to create motion

A
  1. Move the conductor
  2. Move magnetic lines of force
  3. Vary the magnetic flux
21
Q

Faraday’s First Law of ______

A

Electromagnetics

22
Q

Factors regulating strength of induced current

A
  1. Strength of magnetic field
  2. Speed motion between lines of force & conductor
  3. Angle magnetic lines of force & conductor
  4. Number of turns in the conducting coil
23
Q

Lenz’s ______ Law of Electromagnetics

24
Q

Induced currents oppose any _____ change

25
Who is responsible for Mutual Induction
Faraday
26
mutual induction involves _______ & _____ coils
Primary & Secondary
27
Self-Induction has to do with
Alternating current
28
A generator is a device that converts mechanical energy to _______ energy
Chemical
29
AC current ______ permits circuit to remain stationary while armature rotates, connects to one end of armature wire
Generator
30
DC current _______ Single ring, divided in half; each end of wire connected to half of commutator ring
Generator
31
Motors are the same as generators but in _______
reverse
32
A transformer is _______ coils placed near one another
Two
33
Voltage is increased from primary to secondary
Step-up transformer
34
Voltage is decreased from primary to secondary
Step-down transformer
35
Formula for Transformer law
Vs/Vp=Ns/Np
36
37