Question

The source of error in a Wheatstone bridge is due to _________

(a) range of galvanometer used

(b) type of the source of emf used

(c) limiting errors of the three known resistances

(d) balance condition

This question was posed to me in an international level competition.

I would like to ask this question from Measurement Errors in a Wheatstone Bridge in chapter Measurement of Resistance of Electrical Measurements

Answer 1

Correct option is (c) limiting errors of the three known resistances

Easy explanation: The main source of error in a Wheatstone bridge is because of the limiting errors of the three known resistances. As a result very precise resistances are required with 1 % tolerance.