Question

1. The length of different metallic wires but of same area of cross section and made of the same material are given below:WIRE LENGTHA 1mB 1.5mC 2ma.out of these wires,which wire has higher resistance?b.which wire has the highest electrical resistivity?Justify your answer.

Answer 1

We know that the resistance is directly proportional to the length of the conductor.So the wire with longest length will have highest resistance.So, Answer of a. 2m
We know that resistivity
rho=RA/l
So, as much less will be the length of conductor the higher will be resistivity.So Answer of b. 1m

Answer 2

We know that the resistance is directly proportional to the length of the conductor.So the wire with longest length will have highest resistance.So, Answer of 1st question is C. 2m

Wire of 1m length has higher electrical resistivity because it's lenght is minimum in the given question and wire have lower lenght and same area cross section and made of same material have higher electrical resistivity

So, the Answer of 2nd question is A 1m