Question

A rod of length 20 cm is made of metal. It expands
by 0.075cm when its temperature is raised from
0°C to 100°C. Another rod of a different metal B
having the same length expand by 0.045 cm for
the same change in temperature. A third rod of
the same length is composed of two parts, one of
metal A and the other of metal B. This rod expands
by 0.060 cm for the same change in temperature,
The portion made of metal A has the length :
(1) 20 cm
(2) 10 cm
(3) 15 cm
(4) 18 cm​

Answer 1

Answer:

A rod of length 20 cm is made of metal at expand by 0 075 ... expand by 0 045 CM for the same change in temperature at Hot - Physics - Thermal Properties Of Matter