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Ravi Kishan Verma
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Asked: 2025-03-31T06:38:34+00:00 In:

Current sensitivity of a galvanometer can be increased by decreasing:

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0%(A) Magnetic field B
0%(B) Number of turns n
100%(C) Torsional constant k ( 1 voter )
0%(D) Area A
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The correct answer is (C) Torsional constant k.
Sensitivity of a galvanometer is given by S = nBA/K​. Decreasing the torsional constant k increases sensitivity as it reduces the restoring torque per unit twist, allowing greater deflection for a given current.

chapter 4 moving charges and magnetismclass 12thmcqphysics
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    1 Answer

    1. Current sensitivity of a galvanometer is given by
      S = nBA/K
      where n = number of turns, B = magnetic field, A = area of coil and k = torsional constant.
      To increase sensitivity, S should be maximized. Decreasing the torsional constant
      k increases S as they are inversely proportional.
      Hence, the correct answer is (C) Torsional constant k.

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

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