AULA 02 - MAGNETISMO R1.pdf

8/18/2019 AULA 02 - MAGNETISMO R1.pdf

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• Magnetismo é a propriedade quecertos materiais têm de atrairpedaços de ferro.

• Os corpos que possuem magnetismo

são denominados de ÍMÃS.


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A B

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• Os pólos de um imã nãoexistem separadamente;

• Todas substâncias magnéticassão constituídas por imãselementares;

• Um material com átomos ou

moléculas assim alinhados terápólos magnéticos efetivos• Materiais magnéticos: ferro,

níquel e algumas ligasmetálicas, como o aço;• Não magnéticos: alumínio,madeira, plástico, entre outros


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A A C

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A C

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• V ,

.


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A A AB A

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• C , .

• C ,

, .• E

, .


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CA A C

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• C M ,

• A , , .


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CA A C

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• E , , ,

.

• A .

• A

, .

1

2

campomagnético

.


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CA A C

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• O F , Φ,

.

• A F M ( ).U W 1 108


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CA A C

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• D C M D F M C M

F M (W )

( );• R B;• N S I U ,

C M T( T).


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CA A C

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:B D C M D FM , T (T);φ F M , W (W );S , 2.

D 1 = 1 / 2.


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CA A C

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E : U 8.106W 22. D

B.


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C A CA A B C A A CA

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• : S . S , ,

. E : , , , , , ,

, , .


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C A CA A B C A A CA

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• :

, . S , ,

, . E, , , , , .


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AB A A CA

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• A P M

.


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AB A A CA

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A , μ :

A TA , T. /A , H , H/ . A : H=W /A.

A , , P

M R ( μ ). P , , :


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C A A CA

21

A

. A


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C A A CA

22


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C A A CA

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A


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C B A

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• T , .


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A

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• S

:I. C ;

II. C .

III. F M ( ) .


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CA A C A C

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• E B .

• A .


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CA A C A C

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• E B .

• A .


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A A CA A C

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• O

A , ,

(

A ).• S .

O .


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A C

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• V

( )

( )


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A CA A C

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O V C M B


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A B C

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• A , L B S

.2 π µ

⋅

⋅

=

⇒

⇒ ,

µ µµ µ ⇒ .

⋅⋅⋅=− 7104 π µ


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• U 5 . C

P 20 . I .


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• P , :

⋅

⋅⋅=⇒

⋅==⇒

=⇒

−

−

7

1

104

10220

5:

π µ

:

617

1051022

5104

.2−

−

−

⋅=⇒

⋅⋅⋅

⋅⋅⋅

=

⋅

⋅

=

π

π

π

µ

C C


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C C

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, , ,

, . ,

20 , . , ,

:

20 20 20

C C


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C C

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:

20 20 20


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CA A C A A C C A

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• C ( ) .

• A

, .


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CA A C A A C C A

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• A :

⋅

⋅

=

2

µ

⇒ ⇒

µ µµ µ ⇒ .

⋅⋅⋅=− 7104 π µ


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CA A C A A C C A

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• N . O ; , .

CA A C A B B A C A A


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CA A C A B B A C A A

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• U .

⋅

⋅

⋅=

2 µ

⇒

:

A B B A C A A


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A B B A C A A

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• A , ,

.


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• D 4⋅π , 2,0A

,

.


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• A :

5

2

7

10

10422104

2−

−

−

=

⋅⋅⋅

⋅⋅⋅

=

⋅

⋅

=

π

π µ

⋅

⋅⋅=⇒

⋅⋅=⋅=⇒

=⇒

−

−

7

2

104

1044

2

:

π µ

π π

,

CA A C A C


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A B B A A

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CA A C A C


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A B B A A

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CA A C A C A B B A A


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A B B A A

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• P (

.

l

i N B

..=

:



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A B B A A

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A B B A A

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A B B A A

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A B B A A

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U 1000 5,0A. Q

?

⋅

⋅⋅=⇒

=⇒

=⇒

=⇒

− 7104

1

1000

5

:

π µ

3

37

102

1

510104

−

−

⋅⋅=

⋅⋅⋅⋅

=

⋅⋅

=

π

π

µ

CA A C A


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B , [T

μ

( );N

; , [A ;

R , [ .

CA A C AA A


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A A

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• C V C M I V F M (H)

( ) ( ).

• O :

CA A C AA A


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A A

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• O V H V D C M (D FB, A V C M I A

, A / .

CA A C AA A


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A A

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• A D F M B F M H μ.

• P :

• P :

• P :

A A


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A C M I (FM ) H

.

P F M

. E F M .

A A


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A F M :

:FMM F M , A [A

N N ;I I , A [A .

A A


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A A


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A A


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A A


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A A


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A A CA


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• C ( ) ;

• P N ( ), , ,

;

• E , ;

• E . E

A A CA


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,

.

A A CA B C


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A A CA B C


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A


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• A : :

, F.

, B. , I.

• A : :

, F.

, B. , I.

A


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A A CA B C


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U 5A 3T

30, . D ( , ).

A A A C


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A A A C


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C A A A


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• A .

• F M D F M


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C A A A


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A CA


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• BR : D FR MR ;

• HC: C C ;• L H

M

P H

L H .

C CA


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C CA


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A A A 02

Documents

AULA 02 - MAGNETISMO R1.pdf