Question

two wires of same material and same length have radii r1 and r2 compare their resistance and resistivity

Answer 1

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/3.14r2^2R1/R2=3.14r2^2/3.14r1^2R1/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.
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