An aluminium rod must increase in length by 1%. If α_Al=25×10⁻⁶ °C⁻¹, find temperature rise in multiples of 100°C.
Physics · Mixed Chapter
JEE Main Practice

Question

An aluminium rod must increase in length by 1%. If α_Al=25×10⁻⁶ °C⁻¹, find temperature rise in multiples of 100°C.

G1 Physics · Accepted Answer

Step 1: Linear expansion gives ΔL/L=αΔT. Step 2: 0.01=(25×10⁻⁶)ΔT ⇒ΔT=0.01/(25×10⁻⁶)=400°C. Step 3: In hundreds of degrees, answer=400/100=4.