contestada

the length of metallic wire is l1 when tension in it is t1 . it is l2when the tension is t2 . the original length of the wire will be
a) l₁ + l₂ / 2
b) √l₁ l₂
c) l₁ T₂ - l₂T₁ / T₂-T₁
d) l₁T₂ + l₂T₁ /T₂ + T₁