>> . 10-11 .

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1.18. .

, .

q 1 2. 1 - 1, 2 - 2. . , 1 2. . , . .

, , 1 2 (. 1.78). Δ = 2 - 1 :

, (1.17.1), = -(Wp2 - Wp1). (1.18.1) (1.17.1), :

, , , (. 1.79). , X . y z (1.18.2) :

(1.18.3) Wp = mgh . , , h . : . . , . Wp = mgh. , h . (1.18.3) . q , ; , , .

, , X ,

Wp = qE|x| (1.18.4)

Wp = mgh.

, : ΔWp < 0. . , . . , (, , ), ΔWp > 0. , . , : .

, , . (1.18.2) :

. , , . (1.18.2), . . , , 1.79, . , , . , Wp = 0 1 .

, , .

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