Question

A wire has resistance of 2.5 ohm at 28 degree centigrade and a resistance of 2.9 ohm at 100 degree
centigrade The temperature coefficient of resistivity of material of the wire is
O
106 x 10-3
o 3.5% 10-2
2.22 x 10-3
O
3.95 x 10^-2​

Answer 1

Question: A wire has a resistance of 2.5 Ω at 28C and a resistance of 2.9 Ω at 100°C. The temperature coefficient of resistivity of material of the wire is?

Given: A wire has a resistance of 2.5 Ω at 28°C and a resistance of 2.9 Ω at 100°C.

To find: The temperature coefficient of resistivity of material of the wire.

Solution: $2.22\times 10^{-3}$ °$C^{-1}$

Step by Step Explanation:

$R_2_8=2.5\\R_1_0_0=2.9$

Δ$R=\alpha$θ$R_2_8$°$C$

$2.9-2.5=\alpha \times(100-28)\times2.5\\\alpha =2.22\times10^{-3}$