Size of sub matrix H of jacobian

Q.  What is the size of the sub matrix “H “of the jacobian, if n1 is the number of PV buses and n2 the number of PQ buses?
- Published on 19 Oct 15

a. (n1 + n2)2
b. n1 * n2
c. (n1 + n2) n1
d. (n1 + n2) n2

ANSWER: (n1 + n2)2

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