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Common Data for Questions 48 and 49:
With 10 V dc connected at port A in the linear nonreciprocal two-port network shown below, the following were observed:
(i) 1 Ω connected at port B draws a current of 3 A
(ii) 2.5 Ω connected at port B draws a current of 2 A
With 10 V dc connected at port A, the current drawn by 7 Ω connected at port B is
- 3/7 A
- 5/7 A
- 1 A
- 9/A
Correct answer: 1 A
Solution
Using I=E/(R+R0): 3=E/(1+R0) and 2=E/(2.5+R0) give R0=2 ohm and E=9 V. For R=7: I=9/(7+2)=1 A, not 5/7 A.
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