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Problem

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31 Oct 2021

Given information

It is given that two wires, one of copper followed by aluminum, each of diameter 1.4 mm and length 5 m are connected in series. A voltage difference of 95 mV is applied across the composite wire. It is also known that the resistivity of copper and aluminum are respectively    and    .

Step-by-step explanation

Step 1.

 

Area with diameter, d

 

 

The resistance (R) of a resistor is related with the resistivity of it’s material (ρ), it’s length (l) and the cross-sectional area (A) as,

 

Where,   d is the diameter of the resistor.

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