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Ravi Kishan Verma
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Asked: 2025-03-29T08:53:48+00:00 In:

The current sensitivity of a galvanometer increases by 20%. If its resistance also increases by 25%, the voltage sensitivity will

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Poll Results

0%(A) Decrease by 1 %
0%(B) Increase by 5%
0%(C) Increase by 10%
100%(D) Decrease by 4% ( 3 voters )
Based On 3 Votes

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Voltage sensitivity is given by
ls/R’ where I s
​ is current sensitivity. If current sensitivity increases by 20% and resistance by 25%, voltage sensitivity changes by 120/125 = 0.96, i.e., decreases by 4%.
The answer is (D) Decrease by 4%.

chapter 4 moving charges and magnetismclass 12thmcqphysics
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    1 Answer

    1. The voltage sensitivity of a galvanometer is given by:
      Voltage Sensitivity = Current Sensitivity/R
      If current sensitivity increases by 20% and resistance increases by 25%, the net change in voltage sensitivity is:
      1.2/1.25 = 0.96
      This indicates a 4% decrease in voltage sensitivity.
      Answer: (D) Decrease by 4%.

      For more visit here:
      https://www.tiwariacademy.com/ncert-solutions/class-12/physics/chapter-4/

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