Question

Two wires of equal cross-sectional area one of copper and other of magnet has the same resistance which one is longer

Answer 1

copper wire is longer than manganin because manganin have high resistance than a copper metal so to become equal resistance copper wire's length should be long because
R is directly proportional to length
I hope you understand

Answer 2

Answer:

  The magnet wire is longer than copper wire.

Explanation:

If 2 wires of an equal cross-sectional area have the same resistance,

R1= ρ1×L1/A1

R2= ρ2×L2/A2

Since, A1=A2 and R1=R2,

ρ1×L1 = ρ2×L2

Now, if ρ1 > ρ2, L1 < L2 and vice versa.

R=ρlA =>A∞ρ

if l and R are constant

But ρ is greater for manganin than copper, therefore manganin wire is longer than copper wire.