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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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Knowledge Check

  • A birmetallic strip made of aluminium and steel (alpha_(Al) gt alpha_(steel)) on heating the strip will

    A
    remain straight
    B
    get twisted
    C
    will bend with aluminium on concave side.
    D
    will bend with steel on concave side

  • When a bimetallic strip is heated, it

    A
    Does not bend at all
    B
    Gets twisted in the form of an helix
    C
    Bend in the form of an arc with the more expandable metal outside
    D
    Bends in the form of an arc with the more expandable metal inside

  • If a bimetallic strip is heated it will

    A
    bend towards the metal with lower thermal expansion coefficient
    B
    bend towards the metal with higher thermal expansion coefficient
    C
    not bent at all
    D
    twisted at all

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