Length of a wire and its cross sectional area is doubled. What is the change in its resistivity ?
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a) On increasing the area of cross-section, resistance decreases. This is because resistance is inversely proportional to area.
b) H= I^2RT
c)The graph between the potential difference V and the current I flowing through a metallic conductor is a straight line curve. The relation between the voltage V and the current I is linear. R is the resistance of the metallic conductor. R is found by finding the slope of the VI graph.
d)Value of resistance is directly proportional to length & inversely proportional to area. So if both length & cross-sectional area are doubled, value of resistance will remain the same.
e) It should have low melting point, low resistivity(high conductivity)
Explanation:
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