Two rulers made of different materials have the same length L at temperature `T_0`. At a higher temperature the ruler B is longer than the ruler A by `Delta L`, when he change in temperature is `Delta T`. If `alpha_(A) and alpha_(B)` respectively are the coefficients of linear expansion of A and B, then

Options

A. `alpha_(B) = ( Delta L)/( L ( Delta T) ) + alpha_(A)`
B. `alpha_(A) = ( Delta L)/( L ( Delta T) ) + alpha_(B)`
C. `alpha_(B) = ( Delta L)/( L ( Delta T) ) - alpha_(A)`
D. `alpha_(A) = ( Delta L)/( L ( Delta T) ) - alpha_(B)`

Answer

A