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why smaller cross-sectional area increases the resistance of a conductor?

Thank you, that was helpful and nice.

I know that the resistance of an ohmic conductor increases with length because the electrons going through the conductor must undergo more collisions in a longer conductor. But why decreasing the cross-sectional area of the conductor also increases the resistance of a conductor?

Thank you all for the explanation and useful discussion.

This new information for me! Thank you!

Thank you for the useful explanation.

Hello, In the section of Magnetic Force on a Current- Carrying Conductor in the book of College Physics by Serway, it is written that the Current- Carrying Conductor in a magnetic field deflects because the magnetic force on the electrons transfers to the bulk of the wire due to the collisions...