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))`.
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.
Alloys of metals have greater resistivity than that of their constituent metals. Why?
The resistivity of alloys is usually
The temperature coefficient of resistance of an alloy used for making resistor is
The resistance of an alloy
PRADEEP-CURRENT ELECTRICITY-Problems for Practice (B)
