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A power system is represented by its system matrix ZBUS (m × m). Now an element is added in power system network without creating a new node. The dimension of the new impedance matrix will be (a) m × m (b) (m + 1) × (m + 1) (c) (m – 1) × (m – 1) (d) (m + 2) × (m + 2)  

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