Question

Material that is widely used to make wire bound standard resistors is

• A. manganin
• B. iron
• C. copper
• D. tungsten
• E. germanium

Answer 1

The Correct Option is A

Manganin is an alloy of copper, manganese, and nickel that has a very low temperature coefficient of resistance, which makes it ideal for use in standard resistors. This property ensures that the resistance of manganin wire does not change significantly with temperature, making it a preferred material for precise and stable resistors.
Iron, copper, tungsten, and germanium do not exhibit the same combination of stability and low temperature coefficient of resistance as manganin, which is why manganin is commonly used for this purpose.

The correct option is (A) : manganin

Answer 2

The material that is widely used to make wire-bound standard resistors is manganin.  

Reason: Manganin is an alloy of copper, manganese, and nickel. It has:

• Very low temperature coefficient of resistance, meaning its resistance remains stable with temperature changes.
• High stability and reliability over time, making it ideal for standard resistors.

Final Answer: \( \boxed{\text{manganin}} \)