You are Kanika/Kavin of 7, Lake View Road, Jheelpur. You read the given advertisement and wish to apply for the post advertised. Write an job application along with your bio-data.


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 \( r \).