-
At the balance condition of the AC bridge shown in the figure, the value of Z4, would be:
-
- 120∠70°Ω
- 187·5∠–10°Ω
- 187·5∠–70°Ω
- 333·3∠–70°Ω
- 120∠70°Ω
Correct Option: C
Given, Z1 = 200 ∠ 30°Ω
Z2 = 250 ∠ – 40°Ω
Z3 = 150 ∠ 0°Ω
Z4 =?
under the balance condition
| = | ||
| Z2 | Z4 |
or
| Z4 = | |
| Z1 |
| = | |
| 200 ∠ 30° |
| = | |
| 200 cos 30° + j200 sin 30° |
= 187·5 ∠ – 70° Ω
