NEET-XII-Physics
03: Current Electricity
- #6A negligibly small current is passed through a wire of length 15 m and uniform cross-section 6.0 × 10-7 m2, and its resistance is measured to be 5.0 ``\Omega``. What is the resistivity of the material at the temperature of the experiment?
Ans : Length of the wire, l =15 m
Area of cross-section of the wire, a = 6.0 × 10-7 m2
Resistance of the material of the wire, R = 5.0 ``\Omega``
Resistivity of the material of the wire = ``\rho``
Resistance is related with the resistivity as
Therefore, the resistivity of the material is 2 × 10-7 ``\Omega`` m.