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14. (a) What do you understand by the "resistivity" of a substance ?
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Resistivity or specific resistance of a body is a characteristic by which one can judge the electrical property of a substance. ... Resistivity quantifies how strongly a material opposes the flow of electrons through it. If a material has low resistivity, it means it offers less resistance to the electric current.
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Explanation:
Resistivity of a substance is the resistance of unit length and unit area of any substance.
resistivity=R*A/L
SI unit is ohm-m
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