Question

distance of a conducting wire x of length one metre is 5 ohms calculate the resistance of a wire made by same metal whose length is 4 times and area of cross section is 5 times that of wire​

Answer 1

Answer:

GG and then I will be able to make it to the meeting tonight but I will be there at work

Answer 2

New resistance of wire will be 4Ω

Explanation:  

given, length of wire = 1

resistance of wire = 5Ω

let the area of cross-section of wire = A

resistance of any given material is given as

$R= resistivity *\frac{length}{area of cross-section}$

$5= resistivity *\frac{1}{area of cross-section}$

$\frac{resistivity}{area of cross-section} =5$             .....................................(1)

given, length of wire is 4 times so new length = 4 m

area of cross-section is 5 times so new area of cross-section = 5 A

let the new resistance R¹

$R= resistivity *\frac{length}{area of cross-section}$

R¹= $resistivity$ * $\frac{4}{5A}$

bu using equation (1)

R¹ = 5 *$\frac{4}{5}$

R¹ = 4Ω