The best material for making resistances in resistance box (A) Iron (B) silver (C) brass constantan (D)

Choose correct alternative. The best material for making resistance boxes is A. iron B. silver C. brass D. constantan

Constantan is used for making standard resistance because it has

Inside a resistance box various resistance coils are connected

The specific resistance of silver is _______

For making standard resistance wire of following material is used

What are the materials generally used for making standard resistance? Give their compositions .