Two wires of the same material and same length have radii r1 and r2 respectively. Compare: their resistances, and resistivities.
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Answered by
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Length increases resistance increases
kriti49:
Answer is in terms of ratio.
Answered by
50
) R = pl/A
p is resistivity , l is length , A is area. A is 22/7r^2
since material is same , p is same.
take out resistance of both wires and divide the two. you will get the required answer.
R1/R2=pL/3.14r1^2/pL/3.14r2^2
R1/R2=3.14r2^2/3.14r1^2
R1/R2=r2^2/r1^2.
ans will be r2 ^2 : r1^2 .
b) since material is same, resistivity will be same. hence ratio will be 1:1.
if my answer is helpful for you then please mark as brain liest
p is resistivity , l is length , A is area. A is 22/7r^2
since material is same , p is same.
take out resistance of both wires and divide the two. you will get the required answer.
R1/R2=pL/3.14r1^2/pL/3.14r2^2
R1/R2=3.14r2^2/3.14r1^2
R1/R2=r2^2/r1^2.
ans will be r2 ^2 : r1^2 .
b) since material is same, resistivity will be same. hence ratio will be 1:1.
if my answer is helpful for you then please mark as brain liest
reply
resistances is r^2/2:r^2/1
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