Find the length of 13.2 kg of copper wire of diameter 4mm, when 1 cubic cm of copper weights 8.4 gm.

Explanation

Diameter, `d=4.4mm`

`d=4/10=0.4cm`

Radius, `r=d/2`

`r=0.4/2=0.2cm`

Density = `8.4gm`

`therefore` Volume=Weight/Density

`pir^h=13200/8.4` (Weight of `cu=13.2kg` and In gram = `13200g`)

`22/7xx0.2^2xxhxx8.4=13200`

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