A voltmeter of resistance `100 Omega` connected to the terminals of a cell reads 2 V. When the voltmeter is replaced by a resistance `1Omega` and an ammeter of `1Omega` , the ammeter reads 1 A. The EMF of the cell is __________ V.

Explanation

To solve the problem, we need to find the EMF (Electromotive Force) of the cell based on the information provided about the voltmeter and the ammeter setup. Let's break down the solution step by step.

### Step 1: Understand the Setup with the Voltmeter
When the voltmeter (with resistance \( R_v = 100 \, \Omega \)) is connected across the cell, it reads \( V = 2 \, V \). The relationship between the EMF (\( E \)), the current (\( I \)), and the internal resistance (\( r \)) of the cell can be expressed as:
\[ V = E - I \cdot r \]
Here, the current \( I \) through the voltmeter can be calculated using Ohm's law:
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