for two wires of same length and different radii ,does the resistance of wire change?Give reasons
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Yes, Resistance is inversely proportional to the area of cross section of the wire. We know that area=πr². Therefore we can also state that resistance is inversely proportional to radius.
The resistance of a wire changes with the change in radius because a larger(i.e bigger radii) wire has bigger passage for transfer of electrons, thus making it easier for electrons to move around with a comparatively lesser resistance as compared to a wire having smaller radii.
The resistance of a wire changes with the change in radius because a larger(i.e bigger radii) wire has bigger passage for transfer of electrons, thus making it easier for electrons to move around with a comparatively lesser resistance as compared to a wire having smaller radii.
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