We have a 100 m long thin copper wire of resistance `100 Omega` it is melted to make a small rod of length 10 m.
what will be the new resistance ?

Explanation

To find the new resistance of the copper rod formed from the melted wire, we can follow these steps:

### Step 1: Understand the conservation of volume
When the copper wire is melted and reshaped into a rod, the volume of the material remains constant. The volume \( V \) of a wire can be expressed as:
\[ V = A \times L \]
where \( A \) is the cross-sectional area and \( L \) is the length of the wire.
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