Question

Two wires of equal length, one of
copper and other of manganin have the
same resistance, which wire is thicker.​

Answer 1

$R=ρl/A$

or

$A∝ρ$

if l and R are constant.

Since

$</p><p>ρ$

is grater for manganin than for copper, hence manganin wire is thicker than copper wire.