Alloys of metals have greater resistivity than that of their constituent metals. Why?
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To understand why alloys of metals have greater resistivity than that of their constituent metals, we can break down the explanation into clear steps:
### Step-by-Step Solution:
1. **Understanding Resistivity**:
- Resistivity (\( \rho \)) is a property of materials that quantifies how strongly they resist the flow of electric current. It is influenced by the number of free charge carriers (like electrons) and their mobility.
2. **Free Electrons in Metals**:
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A :Alloys of metals usually have greater resistivity than that of their constituent metals. R : Alloys usually have much lower thermal coefficient of resistance than pure metals.
Choose the correct alternatives : (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. (c ) The resistivity of the alloy manganin in (nearly independent of/ increase rapidly ) with increase of temperature. (d) The resistivity of a typical insulator (e.g. amber) is greater than that of a metal by a factor of the order of (10^(22) or 10^(3)) .
Name the constituent metals of bronze.
If the resistivity of an alloy is ____ and that of constituent metal is p, then
Assertion (A): Alloys are commonly used in electrical heating devices like electric iron and heater. Reason (R): Resistivity of an alloy is generally higher than that of its constituent metals but the alloys have low melting points then their constituent metals.
PRADEEP-CURRENT ELECTRICITY-Problems for Practice (B)
