Question

Why is the metre bridge not suitable for measuring very high/very low reistances?

Answer 1

ANSWER:

The meter bridge is sensitive when the resistance of all four arms of the bridge are off the same order. It is so far moderate resistance only the meter bridge becomes insensitive for too high or too low values of resistances. Morever, while measuring low resistances, the resistance of copper strips and the connecting wires become comparable to the unknown low resistance and hence cannot be neglected