Joint Entrance Examination/AIEEE 2009/Q072 RESISTANCE VS TEMPERATURE


Welcome to the Highschool Help Forum!

The forum is currently in "Beta" stage of development. You can ask questions and answer/discuss them. The basic functionalities are present. What's required is a more aesthetic look to the Static pages and a more user friendly setup. This will happen over the time gradually as we start creating some content.

The site has a lot of tools, like posting mathematical calculations, images and diagrams; categorizing questions and so on. Having them here is NO GOOD unless you know how to use them. I am thoroughly against compiling a list of these features and then writing about them. As soon as you do not understand how to do something or use a certain feature, report that on "How To"s Section of the forum. Your queries will be answered there.

If you have any ideas/discussion regarding the site/comments, please go to Discussions regarding Highschool Help Forum

Lastly, thanks for joining in the site's development process! It matters!



Original Question by 164.100.170.4

Here's the question...

Q74. Statement 1: The temperature dependence of resistance is usually given as R = R0(1 + αΔt). The resistance of a wire changes from 100 Ω to 150 Ω when its temperature is increased from 27°C to 227°C. This implies that α = 2.5 × 10–3/°C. Statement 2: R = R0(1 + αΔt) is valid only when the change in the temperature ΔT is small and ΔR = (R – R0) < < R0.

  • (1) Statement 1 is true, statement 2 is true; Statement 2 is the correct explanation of Statement 1
  • (2) Statement 1 is true, Statement 2 is true; Statement 2 is not the correct explanation of Statement 1
  • (3) Statement 1 is false, Statement 2 is true
  • (4) Statement 1 is true, Statement 2 is false

Posted by 164.100.170.4 05:18, 24 September 2009 (UTC)

Post a reply![1]



What's Up?

Latest discussions on the forum

Electricity-And-Magnetism-Help

  1. Joint Entrance Examination/AIEEE 2009/Q072 RESISTANCE VS TEMPERATURE
  2. Joint Entrance Examination/2000 Screening/Q002 Uniform time varying magnetic field and induced electric field
  3. Joint Entrance Examination/AIEEE 2009/Q084 ELECTROSTAT
  4. Joint Entrance Examination/2000 Screening/Q012 Rotating particle with charge q mass m
  5. Joint Entrance Examination/2000 Screening/Q029 Coil of wire with conducting ring at centre and variable current


Physics-Help

  1. User:Thewinster/Sandbox
  2. User:Thewinster/Sandbox/Forum-Watch
  3. Joint Entrance Examination/2000 Screening/Q006 Bohr model of an atom applied to an atom with some hypothetical particle
  4. Joint Entrance Examination/2000 Screening/Q025 Various energies of an electron in bohr model
  5. Joint Entrance Examination/2000 Screening/Q023 capcitors and dielectric, equivalent capcitance



Browse All Available Categories

Physics: Introductory PhysicsMechanicsHeatWaves and OscillationsElectricity And MagnetismOpticsModern Physics
Mathematics: AlgebraTrigonometryCo-Ordinate (Analytical) GeometryCalculusVectors And 3D GeometryMiscellaneous Topics
Chemistry: General Chemistry and Physical ChemistryOrganic ChemistryInorganic Chemistry
Biology: General BiologyAnatomyPhysiologyBotanyZoology
a a


Reply to the thread, posted by 164.100.170.4

Thread post

Additional notes

SOLUTION: [3] As relation R = R0/(1 + αΔt) is valid only when ΔR < < R0.Here ΔR=150-100=50.R0=100.100 and 50 are comparable. Hence statement 1 is false and statement 2 is true.

These comments, along with the notes on the left, were contributed by 164.100.170.4 05:25, 24 September 2009 (UTC)