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Assertion: meterbridge wire is made up o...

Assertion: meterbridge wire is made up of manganin
Reason: The temperature coefficient of resistance is very small for manganin

A

If both Assertion `&` Reason are True `&` the Reason is a correct explanantion of the Assertion

B

If both Assertion `&` Reason True but Reason is not a correct explanation of the Assertion

C

If Assertion is True but the Reason is False

D

If both Assertion `&` Reason are False.

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An electric toaster uses nichrome for its heating element. When a negllgibly small current pases through it, its resistance at room temperature (27.0^(@)C) is found to be 75.3 Omega. When the toaster is connected to a 230 V supply, the current settles, after a few seconds, to a steady value of 2.68A. What is the steady temperature of the nichrome element ? The temperature coefficient of resistance of nichrome averaged over the temperature range involved is 1.70 xx 10 ^(-4)"" ^(@)C ^(-1).

At room temperature (27.0^(@)C) the resistance of a heating element is 100 Omega. What is the temperature of the element if the resistance is found to be 117 Omega. given that the temperature coefficient of the material of the resistor is 1.70 xx 10 ^(-4)"" ^(@)C^(-1).

At room temperature (28.0^(@) C) the resistance of a heating element is 100 Omega . What ic. the temperature of the element if the resistance is found to be 117 Omega , given that the temperature coefficient of the material of the resistor is 1.70 xx 10^(-4)""^(@) C^(-1) .

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 resisitivity 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 (10 ^(22) //10 ^(23)).

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