Question

The resistivity of a conductor in the shape of cube of side 1m is equal to???

Answer 1

Answer:

the resistance across a conductor can be found by relation

R=pL/A

here pis the resistivity of conductor l is the length of conductor and A is its area of cross section.

in the case l=a and A=a²

therefore resistance R=pxl/a

now if the conductor becomes 3a on side

thus in this case l=3a

and A=9 a²

this R ,=p 3a/9a²=pxl/ 3a

dividing ll by l

R¹/R=l/3

thus R¹=3R