Question

Why is it advised to keep null point between 45 cm and 55 cm ina wheatstone bridge?

Answer 1

It is advised to keep the null point between 45 cm and 55 cm in a Wheatstone bridge because of the following reasons :

1. It is done to minimize the effect of neglecting end resistances in calculations.
2. Also, Wheatstone bridge is most sensitive when all four arms have the same order of resistances and thus accuracy increases consequently while the possibility of error decreases.