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In the network shown in the figure, the effective resistance faced by the voltage source is _____ Ω .
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- 3 Ω
- 7 Ω
- 9 Ω
- None of these
Correct Option: A
| Current through the 4-ohm resistor = i - | = | |||
| 4 | 4 |
| Therefore, voltage drop across it = |  |  | × 4 = 3i which must equal V. | ||
| 4 |
Thus effective resistance faced by the voltage source is 3 Ω .
