Question

In a platinum resistance thermometer, the resistance of the wire at ice point and steam point are respectively \(4.2\ \Omega\) and \(4.25\ \Omega\). When the thermometer is kept in a hot water bath, the resistance of the wire is found to be \(4.5\ \Omega\). The temperature of the hot water bath is

• A. \(150^\circ\)C
• B. \(100^\circ\)C
• C. \(300^\circ\)C
• D. \(350^\circ\)C
• E. \(200^\circ\)C

Hint:

For linear thermometer calibration: \[ \theta = \frac{R_\theta - R_0}{R_{100} - R_0}\times 100 \] Always substitute carefully and check if the printed data may contain a typo.

Answer 1

The Correct Option is C