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JIPMER 2004
Exam
JIPMER
Year
2004
Subject
Physics
Chapter
Current Electricity

JIPMER 2004 · Physics · Current Electricity

The resistance of a galvanometer is 50 . When 0.01 A current flows...

The resistance of a galvanometer is 50Ω50 \Omega. When 0.01 A current flows in it, full scale deflection is obtained in galvanometer, the resistance of shunt connected to convert galvanometer into an ammeter of range 5 A , will be

Options

  1. A0.1Ω0.1 \Omega
  2. B0.2Ω0.2 \Omega
  3. C0.3Ω0.3 \Omega
  4. D0.4Ω0.4 \Omega

Correct answer

A. 0.1Ω0.1 \Omega

Step-by-step solution

Here: Ig=0.01 A,G=50ΩI_g=0.01 \mathrm{~A}, G=50 \Omega To convert the galvanometer in to an ammeter of range 5 A , a low resistance is to be connected in parallel with coil of galvanometer. S=ig×Gi−igS=\frac{i g \times G}{i-i_g} =0.01×505−0.01=0.54.99=0.1Ω=\frac{0.01 \times 50}{5-0.01}=\frac{0.5}{4.99}=0.1 \Omega
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