Length of a wire is 3cm
is 3cm, cross sectional area
is 3010 et resistance is on y length
in doubled troos-sectional area
in halved
then find resistivity of conductor.
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22
Answer:
A wire of 3 Ω resistance and 10 cm length is stretched to 30 cm length. Assuming that it has uniform cross - section, what will be its new resistance?
Answered by
36
Answer:
Answer
Original resistance =R o =ρ× aI
The resistance of conductor is directly proportional to its length and inversely proportional to its cross sectional area.
The wire tripled of its previous length so the length will be 3l
And the new cross sectional area will be
3AR n
=3×ρ× A/3l
=9R=9ρ× Al
=9×3=27 ohm
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