The Young's modulus of a wire of length L and radius r is If the length and radius are reduced to L/2 and r/2, then its Young's modulus will be -
(a) 1:1 (b) 1:4
(c) 1:8 (d) 8:1
(b) Young's modulus of wire does not varies with dimension of wire. It is the property of given material.
When a certain weight is suspended from a long uniform wire, its length increases by one cm. If the same weight is suspended from another wire of the same material and length but having a diameter half of the first one then the increase in length will be -
(a) 0.5 cm (b) 2 cm
(c) 4 cm (d) 8 cm