Question

A platinum wire has a resistance of 10 ohm at 0oC and 20 ohm at 273oC. Find the value of temperature coefficient of resistance of platinum. (

Answer 1

Answer:

We know that R=R

0

(1+αΔT)

Thus , the temperature coefficient , α=

R

0

(T−T

0

)

R−R

0

or α=

10(273−0)

20−10

=

273

1

o

C

−1

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