Formulas

  • December 2019
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‫דף נוסחאות‬ ‫מגנטוסטטיקה‬

‫אלקטרוסטטיקה‬

r r ∇ ⋅ B( x, y, z ) = 0 r r r ∇ × B ( x, y , z ) = µ 0 J ( x, y , z ) r r J =ρv

r ρ ( x, y , z ) ∇E ( x, y , z ) =

‫דיברגנץ‬

r ∇ × E ( x, y , z ) = 0

curl

ε0

r r ρ (r ) 2 E = −∇V ( x, y , z ) ∇ V = −

r r r r B = ∇ × A ∇ 2 A = − µ0 J

ε0

r r r r µ0 I dl × ( R − R′) B( P) = r r 4π C∫ R − R′ 3 r r r r µ0 j ( R′) A( R) = r r dV ' 4π ∫∫∫ V ′ R − R′

r r E ( R) =

)

r r r ∇ × H = J ext

∫∫∫

ρ ( R ′)(R − R ′) r

r

r

r r 3 dV ' 4π ε 0 V ′ R − R′ r r 1 ρ ( R′) V ( R) = r r dV ' 4π ε 0 ∫∫∫ V ′ R − R′

r µ Ia 2 sin θ A(r ,θ , ϕ ) = 0 ϕˆ 4r 2 r r r F = qv × B r r M = ∑ mi / ∆V i r r r r r B r B = µ0 H + M ⇔ H ≡ −M

(

1

1

p cos θ 4πε 0 R 2 r r F = qE r r P = ∑ pi / ∆V

VP =

i

r r r D ≡ ε0E − P r r ∇⋅D = ρ

µ0

r r r r r js = M × nˆ jM = ∇ × M

σ POL

r = P ⋅ nˆ

ρ POL

r r = −∇ ⋅ P

r r r D = ε 0 (1 + χ e ) E = ε E

r r r r r r B⋅B B⋅H H ⋅H um = = =µ 2µ 2 2

r r E⋅D u= = = 2 2ε 2 D2 n − D1n = σ E2 t = E1t

r2

B1n = B2 n H1t − H 2t = jext

r2 D

‫אינטגרל‬ ‫סופרפוסוציה‬ (‫)שדות‬ ‫אינטגרל‬ ‫סופרפוסוציה‬ (‫)פוטנציאל‬ ‫שדות של‬ ‫דיפול חשמלי‬ ‫ומגנטי‬ ‫כוח‬ ‫שדות קיטוב‬ ‫ומגנטיזציה‬ ‫שדות העתק‬ ‫ועוצמה‬ ‫מגנטית‬

r r r r B = µ0 (1 + χ m ) H = µ H = µ0 µ r H

εE

‫פוטנציאל‬

‫מטענים‬ ‫וזרמים‬ ‫מושרים‬ ‫חומרים‬ ‫ליניארים‬ ‫צפיפות‬ ‫אנרגיה‬

‫תנאי שפה‬

‫פתרונוש של בעיות שפה באלקטרוסטטיקה‬

:‫קרטזי‬ kx

2

‫אקספוננטים‬-‫ביטוי אלטרנטיבי‬

A exp(ik x x) + B exp(−ik x x)

X ′′ = −k x X ‫פתרון של‬

(‫)א‬

k x2 > 0

‫ממשי‬

A sin (k x x ) + B cos(k x x )

(‫)ב‬

k x2 < 0

‫מדומה‬

C sinh k x x + D cosh k x x

(

)

(

)

C exp( k x x) + D exp(− k x x)

(‫)ג‬

Ax + B

‫אפס‬

k x2 = 0

=

: ‫גלילי‬

R(r )

l

(‫)א‬

kϕ > 0

(‫ )ממשי‬l = kϕ

(‫)ב‬

kϕ < 0

(‫ )דמיוני‬l = i kϕ

(‫)ג‬

kϕ 2 = 0

2

2

l =0

Ar +Br l

−l

Φ (ϕ ) C sin(lϕ ) + D cos(lϕ )

A r il + B r − il

C sinh(lϕ ) + D cosh(lϕ )

A + B ln r

C + Dϕ

:‫שדות משתנים בזמן‬

r r

r r

(‫ ⋅ ∇ )חוק גאוס‬D =

(‫ ⋅ ∇ )העדר מונופול מגנטי‬B = 0

r E×B r r P= = E×H

µ

⎡ Joule Watt ⎤ ⎢ s ⋅ m2 = m2 ⎥ ⎣ ⎦

r r ω ˆ r H= k × D = η −1 kˆ × E k r r ω ˆ r E = − k × B = −η kˆ × H k

η = µ / ε c = 1 / εµ c =

ρ

r r r ∂B (‫ × ∇ )חוק פרדיי‬E + =0 ∂t

r r r r ∂D (‫ × ∇ )חוק אמפר‬H = J + ∂t r r

ω k

‫וקטור פוינטינג‬

‫גלים מישוריים‬

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