Question

(c) If 10 m long manganin wire, 0.13 cm in diameter has resistance of
3.4 Ω , find the resistivity (rho) of the manganin wire. [2

Answer 1

Explanation:

here, it is Given that:

I=1m,d=0.2mm->r=0.1mm and R=10 ohm

by using the formula,

R= pl/ A

=pl/πr²

therefore, p= Rπr²/1

= 10× 3.14×( 0.1× 10 -³)²

= 10× 3.14× 0.1×0.1× 10 to the power -6

= 0.314x 10 to the power-6

= 3.14x 10 to the power-7 ohm- m

hence, the resistivity of the conductor is 3.14× 10 to the power-7 ohm- m