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# CBSE Class 10 Answered

Area of cross section of a conductor is increased two times if its resistance is 20 ohm. Find the new resistance.
Asked by agraharianiruddha | 28 Jun, 2018, 04:54: PM
Expert Answer
Resistance R =     , where ρ is resistivity, L is length and A is area of cross section.
we have = 20Ω.
if cross section area is doubled,then new resitance R' =

it is assumed the cross section is doubled by keeping the length same.
Answered by Thiyagarajan K | 28 Jun, 2018, 09:22: PM

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