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JEE Main 2025 Jan 22 Shift 1, Physics Q10: Introduction And Ohm’s Law

JEE Main2025Jan 22, Shift 1Physics
Q.

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

  1. A
  2. B
  3. C
  4. D
Solution

A standard wire-wound resistor is designed so that its resistance is stable and reproducible. The wire (typically manganin or constantan) is chosen specifically because its resistivity is virtually independent of temperature over the operating range.

The curve that shows essentially flat versus T is therefore the most suitable. This corresponds to option (1).

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