JEE Main 2026 Physics question

An aluminium and steel rods having same lengths and cross-sections are joined to make total length of 120 cm at . The coefficient of linear expansion of aluminium and steel are and , respectively. The length of this composite rod when its temperature is raised to , is cm.

• (1)120.20
• (2)120.15Correct
• (3)120.03
• (4)120.06