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. . 11 .
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>> . 11 .

1.

 


, , .

, S, Δt q (. 12). , , υ, V , V = υΔtS, υ .

, N, , N = nυΔtS.

q, At, q = enυΔtS, .

,

    I = enυS.

, , F = Eq, , . U ~ U. , .

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