Resistance of a metal wire of length `2m` is `30 ohm` at `25°C` if the diameter of the wire is 0.6mm then what will be the resistivity of the metal at that temprature ?

Resistance of a metal wire of length 1 m is 26 Omega at 20^@ C . If the diameter of the wire is 0.3 mm , what will be the resistivity of the metal at that temperature ? Using Table 1.1 , predict the material of the wire.

(a) Define resistivity. Write an expression for the resistivity of a substance. Give the meaning of each symbol which occurs in it. (b) State the SI unit of resistivity. (c) Distinguish between resistance and resistivity. (d) Name two factors on which the resistivity of a substance depends and two factors on which it does not depend. (e) The resistance of a metal wire of length 1m is 26 Omega at 20^(@)C . if the diameter of the wire is 0.3mm, what will be the resistivity of the metal at that temperature?

The frequency ratio of two wires of copper is 2 : 3 if the diameter of the first wire is 0.6mm, the diameter of the other wire is -

The resistivity of iron is 1 xx 10^(-7) ohm -m. The resistance of a iron wire of paritcular length and thickness is 1 ohm. If the length and the diameter of wire both are doubled, then the resistivity in ohm-m will be

The resistance of a wire of length 40 m and radius o.25 mm is 10 Omega . The conductivity of the material of the wire is

The resistance of a wire of length l and diameter d is R . The wire is stretched to double its length. The resistance of the wire will now be