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!


Nuvola apps edu miscellaneous.svg


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]


Nuvola apps krfb.png


What's Up?

Latest discussions on the forum

Electricity-And-Magnetism-Help

  1. Joint Entrance Examination/2000 Screening/Q031 Magnetic fields of parallel wires
  2. Joint Entrance Examination/2000 Screening/Q023 capcitors and dielectric, equivalent capcitance
  3. Joint Entrance Examination/2000 Screening/Q017 Electrostats - energy of a configuration
  4. Joint Entrance Examination/2000 Screening/Q009 Magnetic field ratios in two different cases
  5. Joint Entrance Examination/2000 Screening/Q002 Uniform time varying magnetic field and induced electric field


Physics-Help

  1. Joint Entrance Examination/2000 Screening/Q032 Divergent beam passsing from a glass slab
  2. Joint Entrance Examination/2000 Screening/Q031 Magnetic fields of parallel wires
  3. Joint Entrance Examination/2000 Screening/Q028 Ball dropped from a height, graphs
  4. Joint Entrance Examination/2000 Screening/Q026 Ideal gas and graph of a process
  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


Stock-brush.svg
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)