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Vatsal Mishra
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Asked: 2025-04-04T09:27:50+00:00 In:

A galvanometer with resistance 1000 Ω gives full scale deflection at 0.1 mA. What value of resistance should be added to 1000 Ω to increase its current range 10 A.

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Poll Results

0%(A) 0.01 Ω in series
50%(B) 0.01 Ω in parallel ( 1 voter )
0%(C) 0.10 Ω in series
50%(D) 0.10 Ω in parallel ( 1 voter )
Based On 2 Votes

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(B) is correct. To convert a galvanometer into an ammeter with a 10 A range, a small shunt resistance is added in parallel. Using Rs = Ig⋅G/I−Ig’ we get Rs ≈ 0.01Ω.

chapter 4 moving charges and magnetismclass 12thmcqphysics
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    1 Answer

    1. To convert the galvanometer into an ammeter reading up to 10 A, a small shunt resistance must be added in parallel, allowing most current to bypass the galvanometer. The galvanometer allows only 0.1 mA. Using the formula Rs = Ig.Rg/I-Ig, we get Rs ≈ 0.01Ω.
      Correct answer: (B) 0.01 Ω in parallel.

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