Question

The resistance of a platinum wire is 5ohm at ice point and 5.5ohm at steam point find the temp at which resistance of wire is?

Answer 1

Answer:

resistance of platinum wire at ice point(0degreec)= 5 ohm

resistance of platinum wire at steam point= (100degre)=5.23 ohm

Explanation:

When the thermometer is inserted in hot bath the resistance of platinum is equal to 5.795 ohm

Now, if we suppose

R0= 5 ohm

R100 = 5.23 ohm

Rt=5.795 ohm

As A is equal to R100 -R0/R0*100 =Rt-R0 / R0 * T

Therefore ,Rt-R0/R100-R0*100

= 5.795 -5/5.23 -5 *100

= 345.65 degree C

So the actual temp. of the hot bath is 345.65 degree C as measured by the platinum resistance thermometer.

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