Question

A bimetallic strip is made of metals m1 and m2.On cooling the same temperature m1 contracts more than m2 .On cooling through thesame temlerature m1 contracts more than m2 when the strip is heated it will

Answer 1

your question is -> A bimetallic strip is made of metals M1 and M2. On cooling through the same temperature, M1 contracts more than M2. When the strip is heated, it will

• A) bend towards M1
• B) bend towards M2
• C) not bend at all
• D) direction of bending cannot be predicted

solution : on cooling though the same temperature, M1 contracts more than M2.

i.e., $\Delta l_1$>$\Delta l_2$

or, $l_0\alpha_1\Delta T$ > $l_0\alpha_2\Delta T$

or, $\alpha_1$ > $\alpha_2$

hence, thermal expansion of first metal is higher than that of 2nd metal.

we know, strip will bend with the metal of greater coefficient of thermal expansion on outer side i.e., convex side.

so, bimetallic strip will bend towards M2.

hence, option (2) is correct choice.

Answer 2

Answer:

Bro it will bend towards M2