Paulina/Peter
14, ABC Lane, Greencity
July 5, 2025
Dear Mr. Rajan,
I am honored to accept your invitation to the Class 12 graduation ceremony. I look forward to attending and celebrating the students’ achievements.
Sincerely,
Paulina/Peter


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 \( r \).