Two wires of equal length, one of copper and the other of manganin (an alloy) have the same thickness. Which one can be used for electrical heating devices? Why?

Manganin because being an alloy it has more resistivity than copper

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Copper because it has more conductivity.

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Both because both are good conductors of heat.

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None of them can be used as heating device.

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Solution

The correct option is C Manganin because being an alloy it has more resistivity than copper
Mangan can be used for electrical heating devices because it has very high resistance (about 25 times more than that of copper) and therefore, produces a lot of heat when current is passed through it.

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Similar questions

Explain the following.

(a) Why is the tungsten used almost exclusively for filament of electric lamps?

(b) Why are the conductors of electric heating devices, such as bread-toasters and electric irons, made of an alloy rather than a pure metal?

(d) How does the resistance of a wire vary with its area of cross-section?

(e) Why are copper and aluminium wires usually employed for electricity transmission?

Why are the conductors of electric heating devices, such as toasters and electric irons, made of an alloy rather than a pure metal?

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