66. wo wires of the same material have lengths in the ratio 1 : 2 and their radii are in the ratio

Two wires of the same material have lengths in the ratio 1 : 2 and their radii are in the ratio 1:√2 . If they are stretched by applying equal forces, the increase in their lengths will be in the ratio

(a)   2: √2                                        (b)  √2:2

(c)   1 : 1                                          (d)  1 : 2

Answer-d

(11)