Question

What is electrical resistivity? In a series of a electrical circuit comprising of a resistor having e

metallic wire reads 5A.The reading of the ammeter decreases to half when the length of wire is

doubled. why?​

Answer 1

Explanation:

The resistivity of a material is defined as the resistance of a conductor made of that material of unit length and unit cross-sectional area. R is doubled while V remains unchanged. Hence, current becomes half

Answer 2

$\huge\mathfrak\red{Answer}$

• Property of the conductor which resists the flow of electric current is called resistivity.

• Resistance for a particular material is unique.

• Resistance is directly proportional to length of conductor and inversely proportional to current flow.

• When length is doubled resistance becomes double and current flow reduces to half.

length is doubled resistance becomes double and current flow reduces to half. This is the reason for the decrease in ammeter reading.