How does the resistance of a wire vary with its cross-sectional areal?

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Solution

We have, R = ρ $\frac{L}{A}$

It varies inversely with cross-sectional area

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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?

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