The resistance of a metal wire of length 1m is 3 ohm. The diameter of the wire is 0.2 m. Calculate the resistivity of the metal at the temperature.

The resistance of certain length of wire is R Ohm . It is doubled on itself so that its length is l/2. Its resistance becomes.

A 5 kg wt is suspended from the end of a wire 2.5 m long fixed to a rigid support. The diameter of the wire is 2 mm. If Y = 20 x 10^10 N/m^2 for the material of the wire, find the increase in its length.g = 9.8 m/s^2 .

A wire of resistance 10Omega is stretech to thrice its original length. The resistance of the wire will be