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CBSE Class 10 Answered

numerical
Asked by deepitapai | 05 Feb, 2009, 04:27: PM
answered-by-expert Expert Answer

The resistance(R) is given as

R = ρ l/A        =>     l = RA / ρ

Where ρ-resistivity
            l - Length
            A - Area of crossection

ρ=1.6 Χ 10-6 Ωcm     ;    A = πd2 /4 ;   d= 0.5 x10-1 cm    ; R = 10Ω

l = [ 10 x π(0.05)2 /4] / 1.6 Χ 10-6

l = 1.22 x 10 4 cm

Answered by | 05 Feb, 2009, 05:51: PM

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