CBSE Class 12-science Answered
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Asked by whoami230302 | 17 Jan, 2023, 15:48: PM
Potential difference across 60 cm of potentiometer wire = 20 mV
Potential difference across 300 cm of potentiometer wire = ![begin mathsize 14px style fraction numerator 20 space m V over denominator 60 space c m end fraction cross times 300 space c m space equals space 100 space space m V end style](https://images.topperlearning.com/topper/tinymce/cache/7b2dce6715bf9a067b38c9fb26588665.png)
![begin mathsize 14px style fraction numerator 20 space m V over denominator 60 space c m end fraction cross times 300 space c m space equals space 100 space space m V end style](https://images.topperlearning.com/topper/tinymce/cache/7b2dce6715bf9a067b38c9fb26588665.png)
Current I drawn from battery of EMF 4 V is
![begin mathsize 14px style I space equals space fraction numerator 20 space m V over denominator 20 space capital omega end fraction space equals space 1 space m A end style](https://images.topperlearning.com/topper/tinymce/cache/5fa8fdcbc0481c032c4fc4d22c3c01a6.png)
Potential difference across Resistance R = ( 4 - 0.1 ) V = 3.9 V
Resistance R = ![begin mathsize 14px style fraction numerator v o l t a g e over denominator c u r r e n t end fraction space equals space fraction numerator 3.9 space V over denominator 1 space m A end fraction space equals space 3.9 space k capital omega end style](https://images.topperlearning.com/topper/tinymce/cache/1b519648f76a581ec745b0715c522984.png)
![begin mathsize 14px style fraction numerator v o l t a g e over denominator c u r r e n t end fraction space equals space fraction numerator 3.9 space V over denominator 1 space m A end fraction space equals space 3.9 space k capital omega end style](https://images.topperlearning.com/topper/tinymce/cache/1b519648f76a581ec745b0715c522984.png)
Answered by Thiyagarajan K | 17 Jan, 2023, 16:51: PM
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