Question

A silver wire has a temperature
coefficient of resistivity 4x10^-3°C^-1
and its resistance at 20°C is 10 ohm.
Neglecting any change in dimen-
sions due to the change in
temperature, its resistance at 40°C
is​

Answer 1

Answer:

Hope it helps you!

Explanation:

Given, α=4×10

−3

/

o

C

T

1

=20

o

C

T

2

=40

o

C

Rt

2

=Rt

1

(1+αΔt)

ΔT=40−0=20

o

C

Rt

1

=10Ω

Rt

2

=10(1+4×10

−3

×20]Ω

=10[1+80×10

−3

]

=10[1.08]=10.8Ω.