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What is electrical resistivity? In a series electrical circuit comprising a resistor made up of a metallic wire, the ammeter reads \(5\ A\). The reading of the ammeter decreases to half when the length of the wire is doubled. Why?
The electrical resistivity of a material is defined as the of a conductor of unit length and unit . The SI unit of resistivity is .
The formula for specific resistance is
If the length is doubled, then the resistance is
If the length is doubled, then the new value of current is .
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