Question

In the bridge shown, Z1 = 300 ohm, Z2 = 400 – j300 ohm, Z3 = 200 + j100 ohm. The Z4 at balance is

(a) 400 + j300 ohm

(b) 400 – j300 ohm

(c) j100 ohm

(d) -j900 ohm

I had been asked this question by my college director while I was bunking the class.

This interesting question is from Sinusoidal Steady State Analysis topic in portion Signals and Amplifiers of Electronic Devices & Circuits

Answer 1

Correct answer is (b) 400 – j300 ohm

To explain I would say: Use Z1 x Z4 = Z2 x Z3.