The current flowing in the galvanometer G when key `K_2` is kept open is I. On closing the key
Channel: Doubtnut
Date: 2020-08-02

The current flowing in the galvanometer G when key `K_2` is kept open is I. On closing the key `K_2`, the current in the galvanometer becomes `I//n`, where n is an integer. Figure  img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/PR_XII_V01_C03_S01_505_Q01.png" width="80%" Obtain an expression for resistance G of the galvanometer in terms of R, S and n. To what form does this expression reduce when the value of R is very large as compared to S?