Please wait...
Contact Us
Contact
Need assistance? Contact us on below numbers

For Study plan details

93219 24448 / 89292 63204

10:00 AM to 7:00 PM IST all days.

For Franchisee Enquiry

81783 72169
OR

Chat with us on WhatsApp

or

Thanks, You will receive a call shortly.
Customer Support

You are very important to us

For any content/service related issues please contact on this number

93219 24448 / 99871 78554

Mon to Sat - 10 AM to 7 PM

Home / Doubts and Solutions/JEE/Physics

 
A Rectangular block of iron has dimensions (1.2cm*1.2cm*15cm).Compute the resistance of the block 
a)between the two square ends
b)between the two opposite rectangular faces.
The specific resistance if iron at room temperature is (9.68*10^-8)ohm-meter.
 
 
ANS IS
a)100 micro ohm
b)0.65 micro ohm 

Asked by neeraj.unnao 1st June 2017, 4:46 PM
Answered by Expert
Answer:
begin mathsize 12px style The space resistivity space of space iron space at space room space temperature space is space 9.68 cross times 10 to the power of negative 8 end exponent space straight capital omega. straight m. space For space the space first space case space cross minus sectional space area space of space rectangular space block space is space square equals space left parenthesis 1.2 cross times 10 to the power of negative 2 end exponent straight m right parenthesis squared space equals space space 1.44 cross times 10 to the power of negative 4 end exponent space straight m squared. space From space equation space of space resitance comma space we space know space that space straight R space equals space fraction numerator space ρL over denominator straight A end fraction space space space equals fraction numerator space left parenthesis 9.68 cross times 10 to the power of negative 8 end exponent space straight capital omega. straight m right parenthesis space cross times space left parenthesis 0.15 space straight m right parenthesis over denominator 1.44 cross times 10 to the power of negative 4 end exponent space straight m squared end fraction space space space space space equals 1.0 cross times 10 to the power of negative 4 end exponent space straight capital omega space space space space space equals space 100 space μΩ space space Therefore comma space the space resistance space of space the space block space measured space between space the space two space square space ends space would space be space 100 space μΩ. space space For space the space second space case space cross minus sectional space area space of space rectangular space block space is space rectangular colon space equals space space 1.2 cross times 10 to the power of negative 2 end exponent straight m space cross times space 0.15 space straight m space equals space 1.80 cross times 10 to the power of negative 3 end exponent space straight m squared. space We space use space the space rlation colon straight R space equals space fraction numerator space ρL over denominator straight A end fraction space space space space equals space fraction numerator 9.68 cross times 10 to the power of negative 8 end exponent space straight capital omega. straight m space cross times space 1.2 cross times 10 to the power of negative 2 end exponent straight m over denominator 1.80 cross times 10 to the power of negative 3 end exponent space straight m squared end fraction space space space space equals space 6.5 cross times 10 to the power of negative 7 end exponent straight capital omega space space space space space space space equals space 0.65 space μΩ space space From space the space above space observation space we space conclude space that comma space the space resistance space between space two space opposite space rectangular space faces space would space be space 0.65 space μΩ. end style
Answered by Expert 2nd June 2017, 11:04 AM
Rate this answer
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10

You have rated this answer 6/10

Report an issue
Previous Question
Next Question
Your answer has been posted successfully!

Free related questions

RELATED STUDY RESOURCES :
JEE QUESTION ANSWERS

Browse free questions and answers by Chapters

Trending Tags

trigonometric equations Mole concept linear equations trigonometric ratios circle functions matrix operations integration equivalent resistance magnetic field

Latest Questions

CBSE X Biology
What is enzyme  
Asked by Sureshgowdayd548 28th October 2020, 10:50 PM
JEE Main Mathematics
The following pseudocode is executed using the “Paragraph words” dataset. At the end of the execution, CountB captures the number of verbs with letter count less than the average letter count of verbs. But the pseudocode may have mistakes in one or more lines. Identify all such lines (if any). It is a Multiple Select Question (MSQ).  Error in Line 4  Error in Line 8  Error in Line 11  Error at Line 12  Error in Line 17  Error at Line 18  Error in Line 21 The following pseudocode is executed using the “Words” table. What will be the value of A at the end of the execution?
Asked by amaladelsingh 28th October 2020, 10:24 PM
CBSE X Biology
I want a brief clarity on Taxonomy
Asked by reenacharan2008 28th October 2020, 9:11 PM

Chat with us on WhatsApp