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IMÂ: Dispositivo capaz de atrair Fe, Co, Ni, Aço (ferromagnéticos)
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TIPOS DE IMÃS
NATURAL TEMPORÁRIO
MAGNETITA CONTATO ATRITOCORRENTE ELÉTRICA
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PÓLOS DE UM IMÃ
N S
N S
NN
S
S
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INSEPARABILIDADE DOS PÓLOS
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DOMINÍOS MAGNÉTICOS
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MAGNETISMO E TEMPERATURA
Todo imã natural perde o poder magnético ao atingir uma determinada temperatura, chamada de Ponto de CuriePonto de Curie.
Ferro: Temperatura de Curie: 770°C Cobalto: Temperatura de Curie: 1075°C
Níquel: Temperatura de Curie: 365°C
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MAGNETISMO DA TERRA
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AURORAS POLARES
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CAMPO MAGNÉTICO
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Experiência de Oersted
+-
+-i
i
N N
S S
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Uma corrente elétrica induz, em um condutor, o
surgimento de um campo magnético
(imã).
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CAMPO MAGNÉTICO EM UM FIO RETILÍNEO
i
- + A
B
r
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Módulo do Campo Magnético
r
iB
2
0
0 é a constante de permeabilidade magnética do vácuo e vale 4x10-7 T.m/A
Unidade de B: tesla (T)
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Configuração do Campo Magnético
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r
i
B
REGRA DA MÃO DIREITA
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Campo magnético no centro da Espira Circular
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r
iB
20
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Solenóides
L
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niBiL
NB 00
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N S
B
q
v
q
v
q
v
1
2
3
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Partícula 1e 2: M.R.U
PARTÍCULA 3: ESPIRAL
Fmag.= 0
Fmag.# 0
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MÓDULO:
Fm=q.v.B.senα
DIREÇÃO:
-Perpendicular as linhas do campo magnético
SENTIDO: REGRA DA MÃO ESQUERDA
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F
B
v
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FORÇA MAGNÉTICA MÁXIMA
N S
B
q
v
MCU
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FORÇA MAGNÉTICA EM CORRENTES
N S
B
i
L
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