Topic: Network Theory
The value of resistance R shown in the given figure
- A. 3.5 ohm
- B. 2.5 ohm
- C. 1 ohm
- D. 4.5 ohm
Answer: A. 3.5 ohm
Explanation: Applying KCL at the node above the 7-ohm resistor, let the voltage be V. (V - 50)/6 + V/7 + 4 = 0. Solving this gives V = 14 V. Since the current through R is 4 A, R = V / 4 = 14 / 4 = 3.5 ohm.