Correct Answer - Option 3 : resistance
- The property of any conductor that opposes the flow of electric current through it is called resistance.
- It is denoted by R and the SI unit is the ohm (Ω).
- The resistance of a metallic wire is directly proportional to its length and inversely proportional to its area of cross-section.
The resistance (R) is given by:
R = ρL / A
where ρ is resistivity, L is the length and A is the area of the cross-section.