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NEET 2026
Exam
NEET
Year
2026
Subject
Physics
Chapter
Current Electricity

NEET 2026 · Physics · Current Electricity

A galvanometer of resistance 100\ gives full scale deflection for a...

A galvanometer of resistance 100 Ω100\ \Omega gives full scale deflection for a current of 11 mA. It is converted into an ammeter of range 0−100 - 10 A. The shunt required is :

Options

  1. A0.01 Ω0.01\ \Omega
  2. B0.10 Ω0.10\ \Omega
  3. C1.0 Ω1.0\ \Omega
  4. D0.001 Ω0.001\ \Omega

Correct answer

A. 0.01 Ω0.01\ \Omega

Step-by-step solution

Given G=100 ΩG = 100\ \Omega, Ig=1 mA=10−3 AI_g = 1\text{ mA} = 10^{-3}\text{ A}, and I=10 AI = 10\text{ A}.

The shunt resistance SS required to convert a galvanometer into an ammeter is given by:

S=IgGI−IgS = \dfrac{I_g G}{I - I_g}

Substituting the values:

S=10−3×10010−10−3S = \dfrac{10^{-3} \times 100}{10 - 10^{-3}}

Since 10≫10−310 \gg 10^{-3}, we can approximate 10−10−3≈1010 - 10^{-3} \approx 10.

S≈0.110=0.01 ΩS \approx \dfrac{0.1}{10} = 0.01\ \Omega

Answer: 0.01 Ω0.01\ \Omega
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