15. (a) Write down an expression for the resistance of a metallic wire in terms of the resistivity.
(bl What will be the resistance of a metal wire of length 2 metres and area of cross-see
1.55 x 10 m, if the resistivity of the metal be 2.8 x 10 m ?
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Answer:
Explanation:
A. R = r*l/a
Where R is the resistance of a metallic wire
r is restivity of the wire
l is the length of the wire
a is the cross sectional area of the wire
B. R = r*l/a
r = 2.8*10m
l = 2m
a = 1.55*10m
R = 2.8*10*(2/1.55*10)
R = 361.2 ohms
Hope you understand
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