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Get Answers to all your Questions
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?
Answers (1)
Electrical Resistivity (or resistivity) is a property of the material of a conductor is the resistance offered by the conductor of unit length with the unit cross-sectional area.
Here R is resistance
A is the area of cross-section
l is the length of wire
is the resistivity
Unit of
SI unit of restiivity is
We know that
If the length of the wire is doubled then the resistance of the conductor also doubles. So, the current is reduced to half
Ammetre reading
View full answer
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