A cell supplies a current of 1.2 A through two resistors each of 2 `Omega` connected in parallel. When the resistors are connected in series, it supplies a current of 0.4 A. Calculate :
e.m.f. of the cell.

Explanation

To find the e.m.f. of the cell, we will analyze the two configurations of the resistors: parallel and series.

### Step 1: Calculate the equivalent resistance for the parallel configuration
Given two resistors \( R_1 = 2 \, \Omega \) and \( R_2 = 2 \, \Omega \) connected in parallel, the equivalent resistance \( R_{net} \) can be calculated using the formula:

\[ \frac{1}{R_{net}} = \frac{1}{R_1} + \frac{1}{R_2} \]
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