Question

What is the resistance of a wire if its length is doubled,

• A. becomes twice
• B. becomes thrice
• C. remains same
• D. becomes half

Answer 1

The correct option is A becomes twice

The total length of the wires will affect the amount of resistance. The longer the wire, the more resistance that there will be. There is a direct relationship between the amount of resistance encountered by charge and the length of wire it must traverse. After all, if resistance occurs as the result of collisions between charge carriers and the atoms of the wire, then there is likely to be more collisions in a longer wire. More collisions mean more resistance.
Hence, when the length of the wire is doubled, the resistance of the wire is increased twice.