With $10\:V$ dc connected at port A in the linear nonreciprocal two-port network shown below, the following were observed:
- $1\: \Omega$ connected at port B draws a current of $3\:A$
- $2.5\: \Omega$ connected at port B draws a current of $2\:A$
With $10\: V$ dc connected at port A, the current drawn by $7\:\Omega$ connected at port B is
- $\frac{3}{7}\: A$
- $\frac{5}{7}\: A$
- $1\: A$
- $\frac{9}{7}\: A$