Nichrome has the highest resistivity of `3.5 xx 10^(8)` gamma m.

The rod given in the figure is made up of two different materials. Both have square cross sections of 3 mm side. The resistivity of the first material is 4xx 10^(-3) Omega m and it is 25 cm long while second material has resistivity of 5 xx 10^(-3) Omega m and is of 70 cm long. Whati is the resistance of rod between its ends ?

The rod given in the figure is made up of two different materials. Both have square cross sections of 3 mm side. The resistivity of the first material is 4xx10^(-3)Omega.m and it is 25 cm long while second material has resistivity of 5xx10^(-3)Omega.m and is of 70 cm long. What is the resistivity of rod between its ends?

A bulb with rating 250V, 100W is connected to a power supply of 220 V situatd 10 m away using a copper wire of area of cross section 5 mm^2 . How much power will be consumed by the connecting wire? Resistivity of copper = 1.7 xx 10^(-8) Omegam .

A copper rod of length 20cm and cross-sectional area 2mm^(2) is joined with a similar aluminium rod as shown in figure .Find the resistance of the combination between the ends, Resistivity of copper =1.7xx10^(-8)(Omega)m and that of aluminium =2.6xx10^(-8)(Omega)m .

What length of a copper wire of cross-sectional area 0.01 mm^2 will be needed to prepare a resistance of 1 kOmega ? Resistivity of copper = 1.7 xx 10^(-8) Omega m .

Find the resistance of a copper coil of total wire-length 10m and area of cross section 1.0mm^(2) . What would be the resistance of a similar coil of aluminium? The resistivity of copper =1.7xx10^(-8)(Omega)m and that of aluminium 2.6xx10^(-8)(Omega).

Find the resistance of a hollow cylindrical conductor of length 1.0m and inner and outer radii 1.0mm and 2.0mm respectively. The resistivity of the material is 2.0xx10^(-8)(Omega)m .

Calculate the length of an aluminium wire of diameter 0.5 mm required to have a resistance of3 Omega at 20^(@)C .Rresisitvity of aluminium is 2.8xx10^(-8)Omegam

Calculate the resistance of an aluminium wire of length 50 cm and cross sectional area 2.0mm^(2) . The resistivity of aluminium is (rho)=2.6xx10^(-8)(Omega)m.