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.
(c) The resistivity of the alloy manganin is nearly
independent of/increases 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 (1022/103).
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.
(c) The resistivity of the alloy manganin is nearly independent of/increases 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 (1022/103).
(a) Alloys of metals usually have greater resistivity than
that of their constituent metals.
(b) Alloys usually have lower temperature coefficients of
resistance than pure metals.
(c) The resistivity of the alloy, manganin, is nearly
independent of increase of temperature.
(d) The resistivity of a typical insulator is greater than
that of a metal by a factor of the order of 1022.
(a) Alloys of metals usually have greater resistivity than that of their constituent metals.
(b) Alloys usually have lower temperature coefficients of resistance than pure metals.
(c) The resistivity of the alloy, manganin, is nearly independent of increase of temperature.
(d) The resistivity of a typical insulator is greater than that of a metal by a factor of the order of 1022.
