Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 12-science Answered

plz explain
question image
Asked by nagavalli72003 | 23 Apr, 2020, 02:28: AM
answered-by-expert Expert Answer
By generalized ohm's law, J = σ E  ...................(1)
 
where J is current density , σ is conductivity, E is electric field intensity.
 
Current through the spherical surface of radius r between the given concentrc metallic spheres is given by
 
I = Current density × Area = σ E × 4 π r2 ..................(2)
 
If conductivity σ of medium between concentric metallic spheres is given by, σ = kE  .........(3)
 
Then by substituting for conductivity in eqn.(2), we get current I = 4πr2 kE2 ..................(4)
 
We get electric field E from eqn.(4) as
 
begin mathsize 14px style E space equals space square root of fraction numerator I over denominator 4 pi k end fraction end root space 1 over r end style
Potential V between concentric metallic spheres of radii b and a ( b > a ) is given by
 
begin mathsize 14px style integral subscript a superscript b d V space equals space integral subscript a superscript b E space d r space equals space square root of fraction numerator I over denominator 4 πk end fraction end root integral subscript a superscript b space fraction numerator d r over denominator r end fraction space equals space square root of fraction numerator I over denominator 4 πk end fraction end root space ln b over a end style
Answered by Thiyagarajan K | 23 Apr, 2020, 05:39: PM

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 12-science - Physics
a car battery of 12V as a current 7.5 a when 1.2 oh m load is applied find the internal resistance of the battery
Asked by heymindurownbusiness | 04 May, 2024, 11:15: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
physics
question image
Asked by mailtoanjalip2005 | 16 Mar, 2024, 08:22: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
give me the answer
question image
Asked by patelnamra608 | 26 Jan, 2024, 11:01: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
A resistance of 600 has the color code given by 3 strips. The color of strips (fromleft to right) is given by(1) blue, black & brown(2) blue, brown & black(3) brown, blue & black(4) brown, black & blue Select Answer
Asked by smitdholakiya28 | 17 Dec, 2023, 09:37: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
what is electricity
Asked by shivashikhar69 | 09 Dec, 2023, 02:27: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Find the current supplied by the 7 volts source in the circuit shown in the following figure
question image
Asked by nikhilsai2616 | 19 Nov, 2023, 01:05: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
find current supplied by each battery and power dissipated in 1ohm resistor
question image
Asked by snehashiragannavar773 | 21 Oct, 2023, 02:38: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Find equivalent resistance between A and B
question image
Asked by dr.strange45678 | 02 Aug, 2023, 12:31: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Kirchhoff law
Asked by komalbrar0987 | 17 May, 2023, 06:15: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
solve
question image
Asked by whoami230302 | 17 Jan, 2023, 03:48: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×