Two copper wires are of the same length, but one is thicker than the other.
Which wire will have more resistance?

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Solution

Thin wire will have more resistance. Since $R \propto \frac{l}{A}$ ; where $l =$ length of the wire and $A =$ cross-sectional area of the wire.
As the thickness increases the resistance of the wire decreases, and as the thickness decreases, the resistance of the wire increases.

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Two copper wires are of the same length, but one is thicker than the other.Which wire will have more resistance?

Thin wire will have more resistance. Since R∝lA; where l=length of the wire and A=cross-sectional area of the wire.As the thickness increases the resistance of the wire decreases, and as the thickness decreases, the resistance of the wire increases.

Two copper wires are of the same length, but one is thicker than the other.
Which wire will have more resistance?

Thin wire will have more resistance. Since $R \propto \frac{l}{A}$ ; where $l =$ length of the wire and $A =$ cross-sectional area of the wire.
As the thickness increases the resistance of the wire decreases, and as the thickness decreases, the resistance of the wire increases.