Question

Two wires A and B are of equal lengths, different cross-sectional areas and made of same material.

(a) Resistance of both wires A and B are equal

(b) Resistance of both wires A and B are unequal

(c) Resistivity of wire A is different than that of wire B

(d) Ratio of the resistivities of wire A and wire B is 1/2.
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Answer 1

Answer:

B) Resistance of both wires A and B are unequal

Explanation:

Resistivity of a material depends upon factors like material, pressure and temperature. It doesn't depend on length and cross section area. So, it is same for both the wire.

While resistance of a material is depend on resistivity, length and cross sectional area, here, cross sectional area of both wire is different, so resistance of both will be different.