−
V |
: |
I ( ) ( )!!!
−
|
-
|
|
8. |
9. |
+
:
- (), Q = c m Δtº, .
- (), Q = λ m, λ .
- (), Q = r m, r .
- , Q = q m, q .
(), () t0 = nst!!!
100. |
110. |
+
ρ
: φ = ----- 100 %, φ = ----- 100 %
0 ρ0
:
3 m 3
- , U = --- ---- R , U = --- V.
2 μ 2
- , ' = − .
- , ' = ΔV, ΔV = (V2 − V1) − ,
m
' = --- R Δ, Δ = (2 − 1) − .
μ
: Q1 + Q2 + + Qn = 0.
I : ΔU = + Q, ΔU = Q − '.
I :
1) = const: ΔU = 0 , ==> ' = Q.
2) = const: ΔU = + Q, ΔU = Q − '.
3) V = const: ' = ΔV, ' = 0, ==> ΔU = Q.
4) : Q = 0 , ==> ΔU = .
120. |
Q1 , ,
Q2 , ,
' = (Q1 − Q2) , ().
:
' | Q1 Q2 | | Q2 |
η = ------- 100 %, η = -------------- 100 %, η = 1 − ------- 100 %
| Q1 | | Q1 | | Q1 |
1 2 2
η = ---------- 100 %, η = 1 − ---- 100 %
1 1
130. |
190. |
+
| q1 | | q2 |
: F = k --------------, ε ,
ε r2 k = 9 109 ͷ2/2.
F | q0 |
: = -----, = k -------.
q ε r2
σ
: = -------,
ε ε0
σ = | q | / S .
τ
: = --------------,
2 π ε ε0
τ = | q | / ℓ .
| q |
: = -------------------.
4 π ε ε0 r2
W
: φ = -----.
q
| q |
: φ = -------------------.
4 π ε ε0 r
( ): U = φ1 − φ2, U = ----.
|
|
q
: U = d.
ε ε0 S q
: = ------------, = ----.
d U
U2 q2 q U
: W = --------, W = ------, W = -------.
2 2 2
140. |
240. |
2570. |
190. |
+ + +
:
q
- , I = ---, I = | q | n S υ.
t
ρ ℓ
- , R = -------, ρ ,
S ℓ − ,
S .
U
- , I = ----.
R
- , Q = I2 R Δt.
- , ε = I R + I r.
ε
- , I = -------, r ,
R + r R .
- , = I U.
- ( ), m = k I t, k .
: 1) I = I1 = I2 2) U = U1 + U2 3) R = R1 + R2 R = R1 n 4) U1 R1 ---- = ---- U2 R2 1 1 1 5) --------- = ---- + ---- 1 2 | : 1) I = I1 + I2 2) U = U1 = U2 1 1 1 3) --------- = ---- + ---- R R1 R2 R1 R2 R = ---------- R1 + R2 R = R1 / n 4) I1 R2 ---- = ---- I2 R1 5) = 1 + 2 | R ε = ε1 + ε2 − ε3 R = R + r1 + r2 + r3. |
150. |
:
→ Λ
- , F = I ℓ Sin α, α = (, I).
→ Λ→
- , F = | q0 | υ Sin α, α = (, υ).
→ →
F F !!!
→
I ( ) ( )!!!
→ Λ →
- , = S Cos α, α = (, n); = L I, L .
Δ
- , εi = − ------ N, N ().
Δt
→ Λ→
- , εi = ℓ υ Sin α, α = (, υ).
L ΔI
- , εis = − ---------.
Δt
L I2
- , W = --------.
160. |
:
i(t). u(t) | |||||||
(R) | u = Um s (ωt) i = Im s (ωt) Um Im = ---- R Im = Qm ω Δφ = 0 |
| |||||
() | u = Um s (ωt) i = Im s (ωt + π/2) Um 1 Im = -----, = ------- ω Δφ = π/2 |
| |||||
(L) | u = Um Sin (ωt + π/2) i = Im Sin (ωt) Um Im = -----, L= ω L L Δφ = − π/2 |
|
Im
: I = - -----.
√ 2
Um
: U = - -----.
√ 2
:
________
- , = 2 π √ L .
|
|
- , ω = -- -------- -.
√ L
- , ω = ω0.
- , υ = λ ν.
t
- (), ℓ = -----, = 3 108 /.
180. |
170. |
+
:
- , α = γ.
Sin α n2 υ1
- , -------- = ---- = ---- = n.
Sin β n1 υ2
- , Sin α0 = ---, β = 900.
n
- , n = ----.
υ
|
|
|
|
: 2017-04-15; !; : 263 |
:
,
==> ...