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JEE Main 2025 (22 Jan, Shift 1) · Ohm's Law, Resistivity & Temperature

Ohm's Law, Resistivity & Temperature question from JEE Main 2025 (22 Jan, Shift 1)

Q5JEE Main 2025 · 22 JAN · SHIFT 1Easy

Ohm's Law, Resistivity & Temperature

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

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Answer: (d)

A standard resistor must keep almost the same resistance when temperature changes.
So its material needs a high resistivity and a very small temperature coefficient (e.g. manganin, constantan).
Graph (d): large $\rho$ that rises only slightly with $T$ .
So the answer is (d).

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