To get a maximum current in an external resistance of `8Omega` one can use m rows of n cells (connected in series), connected in parallel. If the total number of cells is 64 each having an e.m.f. of 2V and interanl resistance of `2Omega` , then calculate the number of cells in each row and number of rows.

Explanation

To solve the problem, we need to find the number of cells in each row (n) and the number of rows (m) such that the total number of cells is 64, and the maximum current is achieved when the external resistance equals the internal resistance.

### Step-by-Step Solution:

1. **Understanding the Configuration**:
- We have a total of 64 cells, each with an e.m.f. of 2V and an internal resistance of 2Ω.
- The cells are arranged in m rows of n cells each, where each row is connected in series, and the rows are connected in parallel.

...