The resistivity of alloys $= R_{a l l o y}$ ; The resistivity of constituent metals $= R_{m e t a l}$ . Then, usually,

R_{a l l o y} > R_{m e t a l}

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R_{a l l o y} = R_{m e t a l}

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R_{a l l o y} < R_{m e t a l}

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There is no simple relation between

R_{a l l o y}

and

R_{m e t a l}

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Solution

The correct option is A $R_{a l l o y} > R_{m e t a l}$
In the case of alloys the ions of one material is randomly attached to another ion/ atom of the other material. there is no definite crystal lattice like structure. Hence conduction be tough and thus they have high resistivity.

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Choose the correct alternative:

(a) Alloys of metals usually have (greater/less) resistivity than that of their constituent metals.

(b) Alloys usually have much (lower/higher) temperature coefficients of resistance than pure metals.

(d) The resistivity of a typical insulator (e.g., amber) is greater than that of a metal by a factor of the order of (10²²/10³).

If the resistivity of an alloy is $ρ^{'}$ and that of constituent metal is $ρ$ then :

If the resistivity of an alloy is P¹ and that of metal is P, then

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