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CBSE Class 12-science Answered

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Asked by royamisha521 | 26 May, 2020, 10:44: AM
answered-by-expert Expert Answer
Equivalent resistance is Req 
 
R subscript e q end subscript space equals space 2 r space plus thin space fraction numerator r R subscript e q end subscript over denominator r plus R subscript e q end subscript end fraction space open parentheses r space plus space R subscript e q end subscript close parentheses R subscript e q end subscript space equals space 2 r squared space plus space 2 r R subscript e q end subscript plus space r R subscript e q end subscript r R subscript e q end subscript plus R subscript e q end subscript squared space equals space 2 r squared space plus space 2 r R subscript e q end subscript plus space r R subscript e q end subscript R subscript e q end subscript squared space minus space 2 r R subscript e q end subscript space minus space 2 r squared space equals space 0 R subscript e q end subscript space equals fraction numerator 2 r space plus-or-minus square root of 4 r squared plus 8 r squared end root over denominator 2 end fraction space R subscript e q end subscript space equals space fraction numerator 2 r plus space 2 r square root of 3 over denominator 2 end fraction space equals space r open parentheses 1 plus square root of 3 close parentheses
Answered by Shiwani Sawant | 26 May, 2020, 08:11: PM

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CBSE 12-science - Physics
Find equivalent resistance between A and B
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Asked by arushidabhade | 09 Jul, 2020, 09:28: AM
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CBSE 12-science - Physics
49
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Asked by royamisha521 | 26 May, 2020, 10:44: AM
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CBSE 12-science - Physics
A long uniform wire of resistance 9 ohm is bent into a circle. Two points of the wire at one third of the circumference apart are joined with a cell of emf 1.5 volt and internal resistance 0.5 ohm. Calculate the current in the different parts of the circuit. 
Asked by mridulabarua05 | 09 Feb, 2019, 01:01: PM
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CBSE 12-science - Physics
A resistance is made by joining two wires of same material. The radii of the two wires are 1mm and 3mm respectively,while their lengths are 3 cm and 5 cm respectively.  A battery of emf 16 volt and negligible internal resistance is connected across the resistance.  What is the potential drop along the shorter wire?
Asked by mridulabarua05 | 06 Feb, 2019, 10:01: AM
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CBSE 12-science - Physics
Twelve resistances each of value 2 ohm are connected in the circuit.  What is the effective resistance between A and C ?
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Asked by abhitailor158 | 01 Feb, 2019, 09:50: PM
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CBSE 12-science - Physics
Two coils connected in series have a resistance of 18 and when connected in parallel have a resistance of 4. Find the value of individual resistances of the coils.
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