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a) Write down an expression for the resistance of a metallic wire in terms of resistivity.
b) What will be the resistance of the metal wire of length 2m and area of cross-section 1.55 x 10-6 m2, if the resistivity of the metal is 2.88 x 10-8 ohm m?
a) The resistance of a metallic wire in terms of resistivity is:
R=Aρl
Where ρ is the resistivity and A is the area of cross-section.
b) Given: The resistance of the metal wire of length 2m and area of cross-section 1.55 x 10-6 m2 and the resistivity of the metal is 2.88 x 10-8 ohm m.
To find: We have to find the resistance of the metal wire.
Solution: We know that
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