Assertion. [A] ; Wire A is thin in comparsion to wire B of same material and length ,then
resistance of wire A is greater than resistance of wire B.
Reason [R] ; Resistivity of wire A is greater than resistivity of wire B.
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As the wires are made up of same material and have same length, but wire A is thinner than wire B, hence the resistivity of B is greater than A. As resistance increases with thickness of material.
Resistivity is a material property. And Resistance is inversely proportional to the cross section area of the wire. So, thinner the wire, higher the resistance.
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