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Q.18.    Explain the following.

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

Answers (2)


We know that

                      R=\frac{\rho l}{A}

                    R\alpha \frac{1}{A}

Thus,  the resistance of a wire is inversely proportional to its area of cross-section.

Posted by

seema garhwal

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Where, ρ is the resistivity of the conductor.

 R is the resistance of the conductor,

L is the length of the conductor

A is the cross-sectional area of the conductor.

Since the area is inversely proportional to the resistance, as the area of the wire will increase, the resistance will decrease and vice versa.

Posted by

Anjali Nagar

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