As shown in the figure,a bimetallic strip,consisting of metal G on the top and metal H on the bottom,is rigidly attached to a wall at the left.The coefficient of linear thermal expansion for metal G is greater than that of metal H.If the strip is uniformly heated,it will
A)curve upward.
B)curve downward.
C)remain horizontal,but get longer.
D)remain horizontal,but get shorter.
E)bend in the middle.

Question

As shown in the figure,a bimetallic strip,consisting of metal G on the top and metal H on the bottom,is rigidly attached to a wall at the left.The coefficient of linear thermal expansion for metal G is greater than that of metal H.If the strip is uniformly heated,it will 
A)curve upward. 
B)curve downward. 
C)remain horizontal,but get longer. 
D)remain horizontal,but get shorter. 
E)bend in the middle.

Quizplus · Accepted Answer

Since the coefficient of linear thermal expansion for metal G is greater than that of metal H, metal G will expand more than metal H when heated. This will cause the bimetallic strip to curve downward, as the metal on the top (metal G) will expand more than the metal on the bottom (metal H), causing it to elongate and curve downward.

As Shown in the Figure,a Bimetallic Strip,consisting of Metal G