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(a) Write down an expression for the res...

(a) Write down an expression for the resistance of a metallic wire in terms of the resistivity.
(b) What will be the resistance of metal wire of length 2 metres and ares of cross-section `1.55 xx 10^(-6)m^(2)`, if the resistivity of the metal be `2.8 xx 10^(-8) Omega m`?

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