A stress of `10^7 N m^-2` is required to break a material of density `4 xx 10^4 kg m^-3`. Calculate the length of a wire of this material, which can break under its own weight.

A wire of length 2.0 m, diameter 1.0 mm has 50 xx 10^-3 Omega (ohm) resistance. Calculate the resistivity of the material of a wire.

A copper wire of resistivity 1.6xx10^-8 ohm-m has a cross sectional area of 20xx10^-4 cm^2 . Calculate the length of wire required to make a 10 ohm coil.

The susceptibility of a magnetic material is -4.2 xx 10^-6 . Name the type of magnetic materials it represents.

A magnet weighs 75 g and its magnetic moment is 2xx10^-4 A m^2 . If the density of the material of the magnet is 7.5 xx 10^3 kg m^-3 , calculate the intensity of magnetisation.

A wire having a mass of 0.45 kg posseses a resistanfce of 0.014 Omega . If the resistivity of the material fo wire is 1.78 xx10^-7 Omegam , calculate its length and radius. Given that the density of the material of wire is 8.93 xx10^3 kg m^-3

The tensile strength of steel is 5 xx 10^7 N m^-2 . Find the maximum length of the wire that can hang vertically , without breking it. Densityof steel is 8 xx 10^3 kg m^-3.

Calculate the terminal velocity of air bubble of radius 10^-5 m rising in water of viscosity 10^-2 Nsm^-2 . Density of water 10^3 kg m^-3 and density of air is negligible as compared to water.