When the switch is open in lowerpoint loop of a potentiometer, the balance
Channel: Doubtnut
Date: 12/07/2020

When the switch is open in lowerpoint loop of a potentiometer, the balance point length is `60 cm`. When the switch is closed with a known resistance of `R=4Omega` the balance point length decreases to `40 cm`. Find the internal resistance of the unknown battery.