Ask a Doubt
Request a call back

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

CBSE Class 12-science Answered

A potentiometer wire carries a steady current the potential difference across 70cm length of it balances  the potential difference across a 2 ohm coil supplied by a cell of emf 2v and unknown internal resistance r when 1 ohm coil is placed in parallel with the 2 ohm coil a length equal to  50 cm  of the potentiometer wire is required is balance the potential difference across the parallel combination find the value of r  
Asked by gnivedita2110 | 06 Aug, 2020, 11:46: AM
answered-by-expert Expert Answer
f o r space b a l a n c i n g space l e n g t h space space l subscript 1 equals open parentheses fraction numerator E over denominator R plus r end fraction close parentheses R subscript P over L cross times l subscript 1 open parentheses fraction numerator 2 over denominator 2 plus r end fraction close parentheses R subscript P over L cross times 70 minus negative negative negative negative negative negative left parenthesis 1 right parenthesis F o r space b a l a n c i n g space l e n g t h space l subscript 2 open parentheses fraction numerator 2 over denominator begin display style bevelled 2 over 3 end style plus r end fraction close parentheses R subscript P over L cross times 50 minus negative negative negative negative negative left parenthesis 2 right parenthesis O n space c o m p a r i n g space left parenthesis 1 right parenthesis space a n d space left parenthesis 2 right parenthesis open parentheses fraction numerator 2 over denominator 2 plus r end fraction close parentheses R subscript P over L cross times 70 equals open parentheses fraction numerator 2 over denominator begin display style bevelled 2 over 3 plus r end style end fraction close parentheses R subscript P over L cross times 50 r equals 2.67 o h m s
Answered by Utkarsh Lokhande | 21 Aug, 2020, 07:26: PM

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
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
CBSE 12-science - Physics
solve
question image
Asked by amanpanday6384 | 22 Dec, 2022, 12:42: 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
×