A wire of given material having length I and area of cross-section A has a resistance of `8Omega`. What would be the resistance of another wire of the same material having length `l/2` and area of cross-section 4A?

If the length of a wire is doubled and cross-sectional area is halved, what happens to the resistance?

Explain the following : How does the resistance of a wire vary with its area of cross-section?

A steel wire 4 m in length and 2.4*10^(-7)m^2 in cross - section is stretched by a force of 36N . Calculate the stress and strain .

A wire of length L and radius r is fixed at one end and a force F applied to the other end produces an extension l. the extension produced in another wire of same material of length 2L and radius 2r by a force 2F is

A wire length L and cross sectional area A is made of material of Young's modulus Y . It is strectched by an amount X . The work done is

Calculate the resistivity of a wire having resistance .02 ohm, length = 10 m and area = 1mm^2