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With $10\:V$ dc connected at port A in the linear nonreciprocal two-port network shown below, the following were observed:

  1. $1\: \Omega$ connected at port B draws a current of $3\:A$
  2. $2.5\: \Omega$ connected at port B draws a current of $2\:A$

For the same network, with $6\: V$ dc connected at port A, $1\:\Omega$ connected at port B draws $\frac{7}{3}\:A$. If $8\:V$ dc is connected to port A, the open circuit voltage at port B is

  1. $6\:V$
  2. $7\:V$
  3. $8\:V$
  4. $9\:V$
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