Question

Balance condition can be obtained by _________

(a) varying the standard resistance R3

(b) varying the resistance arms R1 and R2

(c) keeping the unknown resistance R4 constant

(d) by making use of a null detector

This question was posed to me during an internship interview.

Origin of the question is Wheatstone Bridge Balance Condition topic in portion Measurement of Resistance of Electrical Measurements

Answer 1

Correct option is (b) varying the resistance arms R1 and R2

The explanation is: The balance condition in a Wheatstone bridge can be obtained by varying the resistances R1 and R2. Null detector is used for determining balance condition.