Electromagnétisme Flashcards

1
Q

Fréquence des ondes émises par un portable

A

GHz

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2
Q

Fréquence des ondes radio

A

MHz

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3
Q

Fréquence des ondes du signal TV

A

500 MHz

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4
Q

Champ magnétique terrestre

A

B = 4,7 μT

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5
Q

Champ magnétique créé par un aimant

A

B = 1T

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6
Q

Champ magnétique crée par un aimant à bobines supraconductrices

A

B = 100 T

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7
Q

Champ électrique disruptif de l’air

A

E = 36 000 V/cm

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8
Q

Conductivité d’un métal

A

γ = 1•e8 S/m

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9
Q

Résistivité d’un métal

A

ρ = 1•e-8 Ω•m

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10
Q

Cadre de validité de la loi d’Ohm

A

f

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11
Q

Profondeur de peau d’un bon conducteur à 50 Hz

A

δ = 10 mm

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12
Q

Profondeur de peau d’un bon conducteur à 500 Hz

A

δ = 1 μm

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