Question

An aluminum wire of 1 mm diameter is surrounded by a copper sheath of 1 mm thickness. What is the resistance of 10 m of this wire?

A. 0.78

B. 0.39

C. 0.025

D. 0.061

Answer #1

So resisitance of aluminium wire first we evaluate

Now as l =10m

A is cross section area of wire

and resistivity of aluminimum

so plug in all values in formula we get

and For cooper

cross section is

and resistivity of copper

So resistance we determine from formula

and they are connected in parrallel so net resistance is

So,

Option c)

Calculate the ratio of the resistance of 14.0 m of aluminum wire
1.5 mm in diameter, to 28.0 m of copper wire 2.9 mm in diameter.
Assume electrical resistivity of aluminum is 2.65×10−8 Ω⋅m and
electrical resistivity of copper is 1.68×10−8 Ω⋅m.

Calculate the ratio of the resistance of 15.0 m of aluminum wire
2.3 mm in diameter, to 26.0 m of copper wire 1.9 mm in diameter.
The resistivity of copper is 1.68×10−8Ω⋅m and the resistivity of
aluminum is 2.65×10−8Ω⋅m. Express your answer using two significant
figures.

Calculate the ratio of the resistance of 9.4 m of aluminum wire
2.0 mm in diameter, to 15.7 m of copper wire 2.4 mm in diameter.
RAl / RCu = 1.33 Incorrect: Your answer is incorrect.

Find the ratio of the diameter of aluminum to copper wire, if
they have the same resistance per unit length (as they might in
household wiring). The resistivity of Aluminum is 2.65 x
10-8 Ω m ; the resistivity of copper is 1.72 x
10-8 Ω m.

#4. A copper wire is 250 m long and it has a diameter of 0.225 mm.
The resistivity of copper is 1.7 x 10-8 -m. A battery of
negligible internal resistance and emf of 35.0 v is connected
across this wire.
a) Find the resistance of the wire.
b) Find the current through the wire.

1.
A 10.0 m length of wire consists of 5.0 m of copper, followed by
5.0 m of aluminum. Both have a diameter of 1.4 mm. A potential
difference of 95 mV is placed across the composite wire.
*Note* the resistivity of copper is 1.68 x 10
-8 Ohm * m and the resistivity of aluminum is
2.65 x 10 -8 Ohm * m
A. (worth 10 points) What is the equivalent
Resistance of the composite wire?
B. (worth 5 points) What...

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