Question

The ratio of resistivity of two wires is 2:3if the length of one wire is 10metres.calculate the length of other wire so that their resistivity are equal

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Secondary School Physics 8 points

The ratio of resistivity of 2 wires is 2:3 if the length of one wire is 10m. Calculate the length of other wire, show that their resistance are equal. pls answer.

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Tharunyetti

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Answer:

If the resistance and area are equal

then for first wire resistivity =RA/L i.e 2=RA/10

so that RA=20 cm............(1)

for second wire 3=RA/L

so that RA=3L...................(2)

from (1) and(2)

20=3L

then L=20/3

=6.6 cm

so the length of second wire is 6.6 cm

hope it helps you .....