Question

If P/Q=1, unknown resistance S=1000Ω and R could be varied from 0 to 100Ω then the bridge could be ___________

(a) A balanced circuit

(b) A rectified circuit

(c) An unbalanced circuit

(d) An identical circuit

This question was addressed to me in an online interview.

Enquiry is from Measuring Resistance the Wheatstone Bridge and Delta-to-Wye (Pi-to-Tee) Equivalent Circuits topic in section Simple Resistive Circuits of Electric Circuits

Answer 1

Correct option is (c) An unbalanced circuit

Best explanation: P/Q=R/S. If P/Q=1 then according to given range of R and S, the bridge circuit could never be a balanced one.