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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 $7/3$ 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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