JEE Main 2024 Physics question
The resistances of the platinum wire of a platinum resistance thermometer at the ice point and steam point are 8 Ω and 10 Ω respectively. After inserting in a hot bath of temperature 400°C, the resistance of platinum wire is:
Answer: (B)
Solution
with α = (10 − 8)/(8 × 100); at 400°C, R = 8 + 0.02 × 400 = 16 Ω.