-

() n- Ic = f(U) . 4, .

U = 0 , . U < 0 , . U < 0 , U = 0.

U > 0 () - . , , I . U > 0 U = 0.

- n- Ic = f(U) . 4, .

() Ic=f(U) - Ic = f(U) n- . 5, ; .

, , U. Ic = 0 U = 0, .


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