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Ans-17:The resistance of a conductor depends on the cross sectional area of the conductor, the length of the conductor, and its resistivity. It is important to note that electrical conductivity and resistivity are inversely proportional, meaning that the more conductive something is the less resistive it is.
Ans-18:Conductance is defined as the reciprocal of the resistance
Ans-19: The graph between the potential difference V and the current I flowing through a metallic conductor is a straight line curve. In the operating range of values, the relation between the voltage V and the current I is linear.
Ans-20:Yess ohms law hold for a copper wire.
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