1. There is a copper wire of 1 cm diameter and 8 cm length. It is moulded in a wire of 18 cm length. What would be the diameter of this new wire ?





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  • By: anil on 05 May 2019 02.42 am
    Assuming the volume of the wire remains constant. $$ pi d ^ {2} frac{h}{4} = pi D ^ {2} frac{H}{4}$$ So, $$ D ^ {2} = 1 imes frac {8}{18} $$ So, D = 2/3
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