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A bimetallic strip is made of aluminium ...

A bimetallic strip is made of aluminium and steel `(alpha_(Al)gtalpha_(steel)`. On heating, the strip will

A

Remain straight

B

Get twisted

C

Bend with aluminium on concave side

D

Bend with steel on concave side

Text Solution

Verified by Experts

The correct Answer is:
B
Taking torque about the fixed point
`tau_(FB)=tau_(g)`
`[(6-x)Axx1g]((6-x)/(2))costheta=[6Axx(25)/(36)xxg]3costheta`
`implies ((6-x)^(2))/(2)=(6xx25xx3)/(36)implies (6-x)^(2)=25implies 6 -x=5implies x=1m`
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