Current drawn from the cell is maximum when:

Options

A. R=0
B. R=r
C. `R gt r`
D. `R lt r`

Explanation

To determine when the current drawn from a cell is maximum, we can analyze the relationship between the electromotive force (emf) of the cell, the internal resistance of the cell, and the external resistance connected to the cell.

### Step-by-Step Solution:

1. **Understand Ohm's Law**:
The current (I) flowing through a circuit can be described by Ohm's Law, which states:
\[ I = \frac{V}{R} \]
where \( V \) is the voltage (or emf) and \( R \) is the total resistance in the circuit.

2. **Identify the Components**:
In this scenario, we have:
- \( E \): the emf of the cell
- \( r \): the internal resistance of the cell
- \( R \): the external resistance connected to the cell

3. **Total Resistance in the Circuit**:
The total resistance in the circuit when the cell is connected is:
\[ R_{total} = R + r \]

4. **Expression for Current**:
Substituting the total resistance into Ohm's law gives us:
\[ I = \frac{E}{R + r} \]

5. **Maximizing Current**:
To maximize the current \( I \), we need to minimize the total resistance \( R + r \). Since \( r \) (the internal resistance) is a constant for a given cell, we can maximize the current by minimizing the external resistance \( R \).

6. **Conclusion**:
The current drawn from the cell is maximum when the external resistance \( R \) is minimized (ideally approaching zero). Thus, the maximum current occurs when the circuit is short-circuited (i.e., when \( R \) is very small).

### Final Answer:
The current drawn from the cell is maximum when the external resistance \( R \) is minimized.

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