A wire is of lengths `l_(1)` and `l_(2)` when stretched by a force 4 N and 5 N respectively. Then the length of the wire when stretched by a force 7 N will be

Two wires of the same material and length but diameters in the ratio 1:2 are stretched by the same force. The elastic potential energy per unit volume for the wires, when stretched by the same force will be in the ratio

A wire of length L radius r when stretched with a force F changes in length by l. What will be the change in the length of a wire of same material having length 2 L radius 2 r and stretched by a force 2 F ?

A wire of length L and radius r when stretched with a force F changes in length by l. What will be the change in length of a wire of same material having length 2L, radius 2r and stretched by a force 2F?

Two steel wires of lengths 1 m and 2 m have diameters 1 mm and 2mm respectively . If they are stretched by force of 40 N and 80 N respectively, find the ratio of their elongations.

A wire of length 5 m is stretched by 1 mm by a force of 1 N. The value of energy (in mJ) stored in the wire is