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CBSE Class 10 Answered

 Find the area of cross-section of the wire which when connected across the potential difference of 150 volts; produce a current of 5 milli ampere. It is given that the length of the wire is 20 centimeter and resistivity is 10 Ohm-centimeter.
Asked by nehchalrs15 | 02 Oct, 2020, 10:13: AM
answered-by-expert Expert Answer
V equals I R 150 equals 5 cross times 10 to the power of negative 3 end exponent R R equals 30 cross times 10 cubed A l s o space R equals fraction numerator partial differential l over denominator A end fraction 30 cross times 10 cubed equals fraction numerator 10 cross times 10 to the power of negative 2 end exponent cross times 0.2 over denominator A end fraction A equals 6.67 cross times 10 to the power of negative 7 end exponent πr squared equals 6.67 cross times 10 to the power of negative 7 end exponent From space here space radius space can space be space calculated
Answered by Utkarsh Lokhande | 03 Oct, 2020, 13:07: PM

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