Answer Posted / harsh dubey

R=RHO*L/A
MULTIPLY AND DIVIDE BY L
R=RHO*L*L/A*L
AS RHO AND VOLUME(A*L)IS CONSTT.
SO
WE HAVE,
R2/R1=square of (L2/L1)
as increased by 3 times,putting L1=3L2
WE HAVE,
R2=9R1
OR
R2=square of (n)*r........
so correct answer is=90ohm

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