Which of the following resistivity $$(\rho) v/s$$ temperature (T) curves is most suitable to be used in wire bound standard resistors?

So in real wire-wound standard resistors (like manganin, constantan), we choose materials where:

• temperature coefficient is very close to zero
• the ρ-T curve is almost flat over a range

So the correct practical answer is:

→ the curve that is nearly horizontal around room temperature (25°C)
(not perfectly flat, but with very small slope)

In short:

ideal: perfectly horizontal (not practical)

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