and \(n\) \(=\) Number of cells in a row
Then \(m × n = 100\) .....\((i)\)
Also condition of maximum current is \(R = \frac{{nr}}{m}\)
\(==>\) \(25 = \frac{{1 \times n}}{m}\)
\(==>\) \(n = 25 m\) .....\((ii)\)
On solving \((i)\) and \((ii)\) \(m = 2\)