[" A wire of length "L" and cross-sectional area "A" is "],[" made of material of Young's modulus "Y" .The work "],[" done in stretching the wire by an amount "x" is "],[[" (1) "(YAX^(2))/(L)," (2) "(YAx^(2))/(2L)],[" (3) "(2YAx^(2))/(L)," (4) "(4YAx^(2))/(L)]]