Question

calculate the resistance per metre at room temperature of constant wire of diameter 1.25 millimetre the resistivity of constant at room temperature is 5 into 10 raise to minus 7 ohm metre​

Answer 1

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Answer 2

Resistance per meter at constant temperature of constant wire is 0.4 Ohm.

1. Here the resistivity is 5*10^-7 ohm meter.

2.Diameter of the wire is 1.25 *10^-3 meters.

3. Therefore area = 3.14*(1.25*10^-3)^2/4.

4. Therefore Resistance = (resistivity*length)/area.

5. Resistance = 5*10^-7*1/3.14*(1.25*10^-3)^2/4

                       = 2/1.25*1.25*3.14

                      =0.4 Ohm.    

6. since the length is per unit meter therefore l=1 m.