| Anorexia Nervosa | Bulimia Nervosa |
| Characterized by extreme restriction of food intake. | Characterized by binge eating followed by purging. |
| Leads to significant weight loss and malnutrition. | Weight may remain normal or fluctuate. |
| Patient denies hunger and avoids meals. | Patient often feels guilt or shame after eating. |


A battery of emf \( E \) and internal resistance \( r \) is connected to a rheostat. When a current of 2A is drawn from the battery, the potential difference across the rheostat is 5V. The potential difference becomes 4V when a current of 4A is drawn from the battery. Calculate the value of \( E \) and \( r \).