Physics Circle home Student Login

Home›Chapters›Current Electricity PYQs›Kirchhoff's Laws & Measuring Instruments›Question 69

MHT CET 2024 (3 May, Shift 2) · Kirchhoff's Laws & Measuring Instruments

Kirchhoff's Laws & Measuring Instruments question from MHT CET 2024 (3 May, Shift 2)

Q69MHT CET 2024 · 3 MAY · SHIFT 2Medium

Kirchhoff's Laws & Measuring Instruments

When a galvanometer is shunted by a resistance ' SS ', its current capacity increases ' nn ' times. If the same galvanometer is shunted by another resistance S′S', its current capacity increases to n′n'. The value of n′n' in terms of n,Sn, S and S′S' is

Show answer and solution

Answer: (d)

  1. Shunt for nn-fold range: S=Gn−1⇒G=S(n−1)S = \dfrac{G}{n - 1} \Rightarrow G = S(n - 1).
  2. With shunt S′S': n′=1+GS′=1+S(n−1)S′n' = 1 + \dfrac{G}{S'} = 1 + \dfrac{S(n - 1)}{S'}
  3. n′=S(n−1)+S′S′n' = \dfrac{S(n - 1) + S'}{S'}. So the answer is (d).
Report a mistake

More questions on Kirchhoff's Laws & Measuring Instruments