Question

Two wires of equal cross section area one of Copper and other of magnet the same resistance which one will be longer why

Answer 1

Answer:

Explanation:

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

Answer 2

Copper is metal having very low resistance equal to 10^-8 ohm/ metre.

While magnetic wire can be manganin has high resistance but the change in temperature does not affect its resistance .

Because copper has low resistance ,so to gain equal resistance as manganin it should be made longer.

Because resistance is ,R length.ie .R increases with the increase in length.