Questions
At temperature To, two metal strips of length /o and thickness d is bolted so that their ends coincide. The upper strip is made up of metal A and have coefficient of expansion and lower strip is made up of metal B with coefficient of expansion . When temperature of their blastic strip is increased from To to , one stop becomes longer than the other and the blastic strip is bend in the form of a circle as shown in .
The radius of curvature fi of the strip is
detailed solution
Correct option is A
At temperature T0+ΔT, the increase in length LA=l01+αAΔT ....(1)and LB=l01+αBΔT ....(2)Let RA and RB the radius of the strips, then LA=θRA ....(3) and LB=θRB .....(4)where θ = common angle as shown in the fig. (2).From eqs. (1) and (2), we get LA−LB=l0ΔTαA−αB ....(5)From eqs. (3) and (4), we get LA−LB=θRA−RB=θd ....(6)From eqs. (5) and (6), we get θ=l0ΔTαA−αBd .....(7)From eqs. (1), (2), (3) and (4), we get RA+RB=2l0+l0αA+αBΔTθ ....(8)∴Mean radius R is given by R=RA+RB2=2l0+l0αA+αBΔT2θ ....(9)Substituting the value of 0 from eq. (7) in eq. (9), we get R=2l0+l0αA+αBΔT2l0ΔTαA−αB/dor R=2+αA+αBΔTd2αA−αBΔTTalk to our academic expert!
Similar Questions
Two thin metal strips each of 2mm thick, one of brass and the other of iron are fastened together parallel to each other, to form a bimetallic strip. If the strips are of equal length at 0°c . The radius of the arc formed by the bimetallic strip when heated to C is (Coefficient of linear expansion of brass = and of iron = )
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