Three rods of equal length l are joined to form an equilateral triangle PQR. O is the mid point of PQ. Distance OR remains same for small change in temperature. Coefficient of linear expansion for PR and RQ is same i.e. \[{{\alpha }_{2}}\] but that for PQ is \[{{\alpha }_{1}}\]. Then

\[{{\alpha }_{2}}=3{{\alpha }_{1}}\]

\[{{\alpha }_{2}}=4{{\alpha }_{1}}\]

If assertion is true but reason is false.

\[{{\alpha }_{1}}=4{{\alpha }_{2}}\]

Three rods of equal length l are joined to form an equilateral triangl

1.	Three rods of equal length l are joined to form an equilateral triangle PQR. O is the mid point of PQ. Distance OR remains same for small change in temperature. Coefficient of linear expansion for PR and RQ is same i.e. \[{{\alpha }_{2}}\] but that for PQ is \[{{\alpha }_{1}}\]. Then
A.	\[{{\alpha }_{2}}=3{{\alpha }_{1}}\]
B.	\[{{\alpha }_{2}}=4{{\alpha }_{1}}\]
C.	If assertion is true but reason is false.
D.	\[{{\alpha }_{1}}=4{{\alpha }_{2}}\]
Answer» E.

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Three rods of equal length l are joined to form an equilateral triangle PQR. O is the mid point of PQ. Distance OR remains same for small change in temperature. Coefficient of linear expansion for PR and RQ is same i.e. \[{{\alpha }_{2}}\] but that for PQ is \[{{\alpha }_{1}}\]. Then

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