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JEE Main 202228 JulyMorning Shift
Exam
JEE Main
Year
2022
Date
28 July
Shift
Morning Shift
Subject
Physics
Chapter
Magnetic Effects of Current

JEE Main 2022 · 28 July · Morning Shift · Physics · Magnetic Effects of Current

The current sensitivity of a galvanometer can be increased by : (A)...

The current sensitivity of a galvanometer can be increased by :
(A) decreasing the number of turns
(B) increasing the magnetic field
(C) decreasing the area of the coil
(D) decreasing the torsional constant of the spring

Choose the most appropriate answer from the options given below :

Options

  1. A(B) and (C) only
  2. B(C) and (D) only
  3. C(A) and (C) only
  4. D(B) and (D) only

Correct answer

D. (B) and (D) only

Step-by-step solution

The current in the galvanometer is calculated by i=(KNAB)θi = \left(\dfrac{K}{NAB}\right)\theta.

Therefore, the sensitivity of the galvanometer,

dθdi=NABK\dfrac{d\theta}{di} = \dfrac{NAB}{K}

Hence, only options B and D are correct.

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