Volumes Practice Test 1

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Question : 9 of 40

Marks: +1, -0

A copper rod of 1 cm diameter and 8 cm length is drawn into a wire of uniform diameter and 18m length. Find the radius of the wire.

$1/{10}$ cm
$1/{15}$ cm
$1/{20}$ cm
$1/{30}$ cm

Solution:

Here,

πr^2 × 1800

=

π . (1/2)^2 × 8

⇒

r^2

=

2/{1800}

∴ r =

1/{30}

cm

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