Ex 2 IL. 19. This rule can be used for all integers, both positive and negative 27. Impedance in an ac circuit plays the same role that resistance does in a dc circuit 28. Two parallel wires a distance of o apart carry the current i。 Ex3 IL. 7. This facilitates their use in circuit analysis.Ex. 2 II. 19. This rule can be used for all integers, both positive and negative. 27. Impedance in an ac circuit plays the same role that resistance does in a dc circuit. 28. Two parallel wires a distance of δ apart carry the current i. Ex.3 II. 7. This facilitates their use in circuit analysis