Calculate the resistance per metre, at room temperature, of a constantan (alloy) wire of diameter 1.25mm. The resistivity of constant of an at room temperature is `5.0 xx 10^-7 Omega`m.

Calculate the length of a wire of diameter 1 mm needed to prepare a coil of resistance 25 ohm. The resistivity of the material of the wire is 3.14 times 10^(-7) Omega.m .

Determine the resistance of a copper wire having, a length of 0.1 km and diameter of 0.5 mm. [Given: Resistivity of copper = 1.7 times 10^(-8) Omega m ]

The resistance of a wire of length 31.4 m and diameter 1 mm is 20 Omega . Find the resistivity of the material of the wire.

Find the radius of the wire of length 25 m needed to prepare a coil of resistance 25 Omega . The resistivity of the material of the wire is 3.14 xx10^-7 Ω−m .

Calculate the length of a wire of radius 0.5 mm needed to prepare a coil of resistance 40 Omega . The resistivity of the material of the wire is 3.14 times 10^(-7) Omega-m .

Determine the resistance of a copper wire having a length of 1 km and diameter of 0,5 mm. (Given: rho=Resistivity of copper =1.7 times 10^(-8) Omega m )

Calculate the specific resistance of the material of a wire having a resistance of 4.4 Omega , length 1.1 m and radius 0.2 mm.

Calculate the viscous force acting on a rain drop of diameter 1mm, falling with a uniform velocity 2 m//s through air. The coefficient of viscosity of air is 1.8 xx 10^-5 Ns//m^2 .

A 100 watt filament loses all its power by radiation, when it is heated to a temperature 2500 K. If the diameter of the filament is 0.2mm and emissivity of the filament is 0.5, find the length of the filament to ( sigma = 5.67 xx 10^-8 J//m^2sK^4 )