Q. At 00 C , three metal rods form an equilateral triangle. Two rods are of the same material, but the third rod is made of Invar ( its expansion is negligible ). When the triangle is heated upto 1000 C, the angle formed between the two metal rods of the same material is ( pi/ 3 - theta ). Prove that the co-efficient of linear expansion of the two metal rods is3 theta / 200 per degree centigrade.

Navjyot Kalra , 11 Years ago

Grade 10