A metal wire of resistivity` 6.4 x 10^(-5) ohm-cm` and length 1.98 m has a resistance of 7Ω. Find radius of wire

A resistance of 2Omega is to be made from a copper wire (specific resistance 1.7 xx 10^(-8) Omega m ) using a wire of length 50cm. The radius of the wire is

A wire of resistance R ohm is stretched to double its length. What is the new resistance.

A copper wire of cross-sectional area 2mm^(2) resistivity =1.7 xx 10^(-8)Omega m , carries a current of 1A. The electricfield in the copper wire is

A steel wire of length 1.5 m and diameter 0.25 cm is loaded with force of 98N. The increase in length of the wire 1.5×10^-4 m. Calculate the tensile stress and fractional change in length of the wire.

A sliver wire has a resistance of 2.1 ohm at 27.5^@C , and a resistance of 2.7 Omega at 100. Determine the temperature coefficient of resistivity of silver.