Draw `E-r` and `V-r` graphs due to two point charges `+ q` and `-2q` kept at some along the line joining these two charges.

Explanation

To draw the `E-r` (Electric Field vs. Distance) and `V-r` (Electric Potential vs. Distance) graphs due to two point charges `+q` and `-2q`, we will follow these steps:

### Step 1: Understand the Setup
We have two point charges:
- Charge `+q` located at point A.
- Charge `-2q` located at point B.

We will analyze the electric field and potential along the line joining these two charges.
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