Calculate the % increase in the length of a wire of diameter 2.5 mm stretched by a force of 100 kg f. Y for the wire ` = 12.5 xx 10^11` dyne `cm^-2`

A one metre long wire having area of cross-section 1 mm^2 is stretched by a mass of 3 kg. Calculate the increase in length. Take Y = 2 xx 10^11 N m^-2

Calculate the resistivity of the material of a wire 2 m long. 0.4 mm in diameter and having a resistance of 4Omega .

A steel wire of mass mu per unit length with a circular cross section has a radius of 0.1 cm. The wire is of length 10 m when measured lying horizontal, and hangs from a hook on the wall. A mass of 25 kg is hung from the free end of the wire. Assuming the wire to be uniform and lateral strains < < longitudinal strains, find the extension in the length of the wire. The density of steel is 7860 kg m^-3 (Young's modulues Y = 2 xx 10^11 N m^-2)

Calculate the electric field in a copper wire of cross-sectional area 2.0 mm^2 carrying a current of 1 A. The conductivity of copper = 6.25 xx 10^7 S m^-1

A solid lead ball of radius 7 cm is melted is converted into a wire of diameter 0.2 cm. find its length of the wire.

Calculate the current in a circular coil of radius 5 cm and 100 turns to produce a field of 2 xx 10^-5 T at its centre.

Calculate the conductivity of a wire of length 200 cm, area of cross-section 2cm^2 and of resistane 5xx10^4Omega .

Calculate the resistivity of the material of wire 1.0 m (meter) long 0.4 mm (millimeter) in diameter and having resistance of 2.0 ohm.