How can we make a galvanometer with `G=20 Omega` and `i_g=1.0 mA` into a voltmeter with a maximum range of `10 V`?

Explanation

To convert a galvanometer into a voltmeter, we need to add a series resistance (let's call it \( R \)) to the galvanometer. Here’s how we can find the value of \( R \) step by step:

### Step 1: Understand the given parameters
- The resistance of the galvanometer \( G = 20 \, \Omega \)
- The maximum current through the galvanometer \( i_g = 1.0 \, \text{mA} = 1.0 \times 10^{-3} \, \text{A} \)
- The maximum voltage we want to measure with the voltmeter \( V = 10 \, V \)

### Step 2: Use the formula for voltage in a series circuit
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