Question

A wire of given material having length l and area of cross section A has resistance of 4Ω .What would be the resistance wire of another wire of same material l/2 and area of cross section 2A?

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Answer 1

Answer:

the resistance will be 1 ohm

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Answer 2

Answer:

εηηο!❤

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As we know ,resistivity is

ρ=R x l/ A

So ,resistance is

R= ρ x l /A

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for first wire,

R1 = ρ x l/A =4Ω

For second wire,

R2 =ρ xl/2/2A = 1/4Ω

R2=1/4 R1

=>1/4 x4

=>1Ω

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the resistance of wire is 1Ω