Physics Current Electricity Electric Conduction, Ohm's Law, Electric Current, Potential Deffrence Single Correct MCQ
Published on: September 13, 2026

The resistivity of alloys $= R_{\text{alloy}}$ ; the resistivity of constituent metals $\mathbf{R}_{\text{metal}}$ . Then, usually

A
$R_{\text{alloy}} = R_{\text{metal}}$
B
$R_{\text{alloy}} < R_{\text{metal}}$
C
There is no simple relation between $R_{\text{alloy}}$ and $R_{\text{metal}}$
D
$R_{\text{alloy}} > R_{\text{metal}}$

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Text Solution

Verified by Experts
The correct answer is:
C
When considering the resistivity of alloys compared to their constituent metals, it is important to note that alloys often exhibit different electrical properties than the pure metals that make them up.
  • The resistivity of an alloy is influenced by the geometric arrangement and electron interaction between its constituent metals.
  • Generally, there is no straightforward relationship connecting the resistivity of alloys directly to the resistivity of the constituent metals because it can depend on the specific proportions and types of metals in the alloy.
  • Depending on the alloying elements and their concentrations, some alloys can have a resistivity lower than, equal to, or greater than that of the individual metals.
Therefore, the correct option is C: "There is no simple relation between the resistivity of the alloy and the resistivity of the constituent metals."

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