Temperature coefficient of resistance of platinum is 4 10⁻³ / K at 20^ C . Temperature at which increase in resistance of platinum is 10 % its value at 20^ C is

Step-by-step solution

Given, _ r =4 10⁻³ / K , T₁=20^ C Final resistance, R₂=R+10 % R=1.1 R We know that, R= _ r R T array lc & 1.1 R-R=4 10⁻³ R (T₂-20 ) & 0.1=4 10⁻³ (T₂-20 ) & T₂=25+20=45^ C array